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Q11. Which aldehyde does not give Schiff’s test?
कौन-सा एल्डिहाइड शिफ़ परीक्षण नहीं देता?
A. Formaldehyde / फॉर्मल्डिहाइड
B. Acetaldehyde / एसीटैल्डिहाइड
C. Benzaldehyde / बेंज़ाल्डिहाइड
D. All aldehydes / सभी एल्डिहाइड
✔ Answer: C / Benzaldehyde (बेंज़ाल्डिहाइड)
Explanation: Aromatic aldehydes give very slow or negative Schiff’s test.
Q12. Oxidation of aldehydes generally gives:
एल्डिहाइड के ऑक्सीकरण से सामान्यतः क्या बनता है?
A. Alcohol / अल्कोहल
B. Ketone / कीटोन
C. Carboxylic acid / कार्बोक्सिलिक अम्ल
D. Ester / एस्टर
✔ Answer: C / Carboxylic acid (कार्बोक्सिलिक अम्ल)
Explanation: Aldehydes are easily oxidised to corresponding carboxylic acids.
Q13. Which compound shows keto–enol tautomerism?
कौन-सा यौगिक कीटो-इनोल टॉटोमेरिज़्म दर्शाता है?
A. Methanal / मेथनाल
B. Acetone / एसीटोन
C. Benzaldehyde / बेंज़ाल्डिहाइड
D. Formic acid / फॉर्मिक अम्ल
✔ Answer: B / Acetone (एसीटोन)
Explanation: Keto–enol tautomerism requires α-hydrogen.
Q14. Which reagent oxidises aldehyde but not ketone?
कौन-सा अभिकर्मक एल्डिहाइड को ऑक्सीकृत करता है पर कीटोन को नहीं?
A. KMnO₄
B. Tollens’ reagent
C. NaBH₄
D. H₂/Pd
✔ Answer: B / Tollens’ reagent
Explanation: Tollens’ reagent selectively oxidises aldehydes.
Q15. Which acid is present in vinegar?
सिरके में कौन-सा अम्ल पाया जाता है?
A. Formic acid / फॉर्मिक अम्ल
B. Oxalic acid / ऑक्सैलिक अम्ल
C. Acetic acid / एसीटिक अम्ल
D. Citric acid / साइट्रिक अम्ल
✔ Answer: C / Acetic acid (एसीटिक अम्ल)
Explanation: Vinegar contains dilute acetic acid.
Q16. Which compound gives positive iodoform test?
कौन-सा यौगिक आयोडोफॉर्म परीक्षण देता है?
A. Methanol / मेथनॉल
B. Ethanol / एथेनॉल
C. Benzyl alcohol / बेंज़िल अल्कोहल
D. Phenol / फिनॉल
✔ Answer: B / Ethanol (एथेनॉल)
Explanation: Ethanol forms acetaldehyde which gives iodoform test.
Q17. Rosenmund reduction is used to prepare:
रोसेनमंड अवकरण का उपयोग किसके निर्माण में होता है?
A. Alcohol from acid
B. Aldehyde from acyl chloride
C. Ketone from acid
D. Ester from aldehyde
✔ Answer: B / Aldehyde from acyl chloride
Explanation: Rosenmund reduction converts acyl chloride to aldehyde.
Q18. Which acid shows strongest intermolecular H-bonding?
कौन-सा अम्ल सर्वाधिक अंतराअणुक हाइड्रोजन बॉन्डिंग दर्शाता है?
A. Formic acid
B. Acetic acid
C. Benzoic acid
D. Oxalic acid
✔ Answer: D / Oxalic acid
Explanation: Presence of two –COOH groups increases hydrogen bonding.
Q19. Carboxylic acids exist as dimers due to:
कार्बोक्सिलिक अम्ल डाइमर के रूप में क्यों पाए जाते हैं?
A. Ionic bonding
B. Covalent bonding
C. Hydrogen bonding
D. Dipole interaction
✔ Answer: C / Hydrogen bonding
Explanation: Strong intermolecular hydrogen bonding causes dimerisation.
Q20. Which compound gives silver mirror test?
कौन-सा यौगिक सिल्वर मिरर परीक्षण देता है?
A. Acetone
B. Benzophenone
C. Acetaldehyde
D. Acetic acid
✔ Answer: C / Acetaldehyde
Explanation: Aldehydes reduce Tollens’ reagent.
Q21. Which acid is used for removing rust?
जंग हटाने के लिए कौन-सा अम्ल उपयोग होता है?
A. Acetic acid
B. Oxalic acid
C. Citric acid
D. Formic acid
✔ Answer: B / Oxalic acid
Explanation: Oxalic acid dissolves iron oxide.
Q22. Which ketone gives iodoform test?
कौन-सा कीटोन आयोडोफॉर्म परीक्षण देता है?
A. Propanone
B. Butanone
C. Pentanone
D. Cyclohexanone
✔ Answer: A / Propanone (Acetone)
Explanation: Methyl ketones give iodoform test.
Q23. Which compound is least acidic?
कौन-सा यौगिक सबसे कम अम्लीय है?
A. Formic acid
B. Acetic acid
C. Benzoic acid
D. Phenol
✔ Answer: D / Phenol
Explanation: Phenol is weaker acid compared to carboxylic acids.
Q24. Decarboxylation of sodium salt gives:
सोडियम लवण का डी-कार्बोक्सीलेशन क्या देता है?
A. Alkene
B. Alkane
C. Alcohol
D. Aldehyde
✔ Answer: B / Alkane
Explanation: Decarboxylation produces alkane with one carbon less.
Q25. Which reagent converts acid to acyl chloride?
कौन-सा अभिकर्मक अम्ल को एसिल क्लोराइड में बदलता है?
A. SOCl₂
B. NaOH
C. NH₃
D. H₂
✔ Answer: A / SOCl₂
Explanation: Thionyl chloride converts acids into acyl chlorides.
Q26. Which compound does NOT show aldol condensation?
कौन-सा यौगिक एल्डोल संघनन नहीं दर्शाता?
A. Acetaldehyde
B. Benzaldehyde
C. Acetone
D. Propanal
✔ Answer: B / Benzaldehyde
Explanation: Benzaldehyde lacks α-hydrogen.
Q27. Which acid is aromatic?
कौन-सा अम्ल एरोमैटिक है?
A. Acetic acid
B. Benzoic acid
C. Formic acid
D. Oxalic acid
✔ Answer: B / Benzoic acid
Explanation: Benzoic acid contains benzene ring.
Q28. Which reaction gives ester?
कौन-सी अभिक्रिया से एस्टर बनता है?
A. Aldol
B. Cannizzaro
C. Esterification
D. Decarboxylation
✔ Answer: C / Esterification
Explanation: Acid + alcohol → ester.
Q29. Which compound gives fruity smell?
कौन-सा यौगिक फल जैसी गंध देता है?
A. Aldehyde
B. Ketone
C. Ester
D. Acid
✔ Answer: C / Ester
Explanation: Esters are responsible for fruity odours.
Q30. Which acid is present in ant sting?
चींटी के डंक में कौन-सा अम्ल होता है?
A. Acetic acid
B. Formic acid
C. Citric acid
D. Lactic acid
✔ Answer: B / Formic acid
Explanation: Ant sting contains formic acid.
Q31. Which reagent reduces carboxylic acid to alcohol?
कौन-सा अभिकर्मक कार्बोक्सिलिक अम्ल को अल्कोहल में बदलता है?
A. NaBH₄
B. LiAlH₄
C. KMnO₄
D. Tollens
✔ Answer: B / LiAlH₄
Explanation: LiAlH₄ is a strong reducing agent.
Q32. Which compound is aldehyde?
कौन-सा यौगिक एल्डिहाइड है?
A. CH₃COCH₃
B. CH₃CHO
C. CH₃COOH
D. C₆H₅OH
✔ Answer: B / CH₃CHO
Explanation: Presence of –CHO group indicates aldehyde.
Q33. Which test confirms –COOH group?
–COOH समूह की पुष्टि कौन-सा परीक्षण करता है?
A. Fehling
B. Litmus
C. NaHCO₃ test
D. Iodoform
✔ Answer: C / NaHCO₃ test
Explanation: CO₂ effervescence confirms carboxylic acid.
Q34. Which compound is ketone?
कौन-सा यौगिक कीटोन है?
A. Methanal
B. Ethanal
C. Propanone
D. Formic acid
✔ Answer: C / Propanone
Explanation: Ketones contain >C=O group between two carbons.
Q35. Which acid is dibasic?
कौन-सा अम्ल द्विक्षारीय है?
A. Formic acid
B. Acetic acid
C. Oxalic acid
D. Benzoic acid
✔ Answer: C / Oxalic acid
Explanation: Oxalic acid has two –COOH groups.
Q36. Which compound shows Cannizzaro reaction?
कौन-सा यौगिक कैनिज़ारो अभिक्रिया करता है?
A. Acetaldehyde
B. Formaldehyde
C. Propanal
D. Acetone
✔ Answer: B / Formaldehyde
Explanation: Formaldehyde lacks α-hydrogen.
Q37. Which functional group is present in ketone?
कीटोन में कौन-सा क्रियात्मक समूह होता है?
A. –CHO
B. –COOH
C. >C=O
D. –OH
✔ Answer: C / >C=O
Explanation: Ketones contain carbonyl group between two carbons.
Q38. Which compound is used in nail polish remover?
नेल पॉलिश रिमूवर में कौन-सा यौगिक होता है?
A. Ethanol
B. Acetone
C. Benzene
D. Methanol
✔ Answer: B / Acetone
Explanation: Acetone is an effective organic solvent.
Q39. Which acid forms anhydride easily?
कौन-सा अम्ल आसानी से एनहाइड्राइड बनाता है?
A. Formic
B. Acetic
C. Benzoic
D. Oxalic
✔ Answer: B / Acetic acid
Explanation: Acetic acid readily forms acetic anhydride.
Q40. Which compound gives pleasant smell?
कौन-सा यौगिक सुखद गंध देता है?
A. Acid
B. Aldehyde
C. Ketone
D. Ester
✔ Answer: D / Ester
Explanation: Esters have pleasant fruity smell.
Q41. Which aldehyde is aromatic?
कौन-सा एल्डिहाइड एरोमैटिक है?
A. Methanal
B. Ethanal
C. Benzaldehyde
D. Propanal
✔ Answer: C / Benzaldehyde
Explanation: Benzaldehyde contains benzene ring.
Q42. Which compound reacts with NaHCO₃?
कौन-सा यौगिक NaHCO₃ से अभिक्रिया करता है?
A. Alcohol
B. Aldehyde
C. Ketone
D. Carboxylic acid
✔ Answer: D / Carboxylic acid
Explanation: Carboxylic acids release CO₂ with NaHCO₃.
Q43. Which is simplest aldehyde?
सबसे सरल एल्डिहाइड कौन-सा है?
A. Methanal
B. Ethanal
C. Propanal
D. Benzaldehyde
✔ Answer: A / Methanal
Explanation: Methanal has only one carbon atom.
Q44. Which compound is weakest acid?
कौन-सा यौगिक सबसे कमजोर अम्ल है?
A. Formic acid
B. Acetic acid
C. Benzoic acid
D. Ethanol
✔ Answer: D / Ethanol
Explanation: Alcohols are much weaker acids.
Q45. Which test is used for methyl ketone?
मिथाइल कीटोन के लिए कौन-सा परीक्षण होता है?
A. Fehling
B. Tollens
C. Iodoform
D. Schiff
✔ Answer: C / Iodoform test
Explanation: Methyl ketones give yellow iodoform precipitate.
Q46. Which acid is used in soft drinks?
सॉफ्ट ड्रिंक्स में कौन-सा अम्ल होता है?
A. Citric acid
B. Oxalic acid
C. Formic acid
D. Benzoic acid
✔ Answer: A / Citric acid
Explanation: Citric acid gives sour taste.
Q47. Which compound undergoes nucleophilic addition?
कौन-सा यौगिक न्यूक्लियोफिलिक योग अभिक्रिया करता है?
A. Alkane
B. Alkene
C. Aldehyde
D. Ether
✔ Answer: C / Aldehyde
Explanation: Polar C=O group favours nucleophilic addition.
Q48. Which group increases acidity of carboxylic acid?
कौन-सा समूह अम्लीयता बढ़ाता है?
A. –CH₃
B. –C₂H₅
C. –NO₂
D. –NH₂
✔ Answer: C / –NO₂
Explanation: Electron-withdrawing groups increase acidity.
Q49. Which compound is aldehyde functional group?
एल्डिहाइड का क्रियात्मक समूह कौन-सा है?
A. –CO–
B. –COOH
C. –CHO
D. –OH
✔ Answer: C / –CHO
Explanation: –CHO group defines aldehydes.
Q50. Which acid gives effervescence with Na₂CO₃?
कौन-सा अम्ल Na₂CO₃ के साथ उफान देता है?
A. Phenol
B. Alcohol
C. Carboxylic acid
D. Aldehyde
✔ Answer: C / Carboxylic acid
Explanation: CO₂ gas is released due to acid–carbonate reaction.
- Marks: 0.5 × 50 = 25 marks
- Question Type: Knowledge-based
Q1. Which functional group is present in aldehydes?
एल्डिहाइड में कौन-सा क्रियात्मक समूह पाया जाता है?
A. –COOH / कार्बोक्सिल समूह
B. –CHO / एल्डिहाइड समूह
C. –CO– / कीटोन समूह
D. –OH / हाइड्रॉक्सिल समूह
✔ Answer:
B. –CHO / एल्डिहाइड समूह
Explanation (English):
Aldehydes contain the –CHO (formyl) functional group at the end of the carbon chain.
Q2. The IUPAC name of CH₃CHO is:
CH₃CHO का IUPAC नाम है:
A. Methanal / मेथनाल
B. Ethanal / एथनाल
C. Propanal / प्रोपनाल
D. Acetone / एसीटोन
✔ Answer:
B. Ethanal / एथनाल
Explanation:
CH₃CHO has two carbon atoms with an aldehyde group → Ethanal.
Q3. Which compound gives Tollens’ test?
कौन-सा यौगिक टॉलेंस परीक्षण देता है?
A. Acetone / एसीटोन
B. Benzophenone / बेंजोफिनोन
C. Formaldehyde / फॉर्मल्डिहाइड
D. Acetic acid / एसीटिक अम्ल
✔ Answer:
C. Formaldehyde / फॉर्मल्डिहाइड
Explanation:
Tollens’ test is given by aldehydes due to oxidation of –CHO group.
Q4. Which of the following is a ketone?
निम्न में से कौन-सा कीटोन है?
A. CH₃CHO
B. HCHO
C. CH₃COCH₃
D. HCOOH
✔ Answer:
C. CH₃COCH₃
Explanation:
Ketones have carbonyl group (>C=O) bonded to two carbon atoms.
Q5. The functional group present in carboxylic acids is:
कार्बोक्सिलिक अम्लों में पाया जाने वाला क्रियात्मक समूह है:
A. –CHO
B. –CO–
C. –COOH
D. –OH
✔ Answer:
C. –COOH
Explanation:
Carboxylic acids contain the carboxyl group (–COOH).
Q6. Which of the following is the strongest acid?
निम्न में से सबसे प्रबल अम्ल कौन-सा है?
A. Phenol / फिनॉल
B. Ethanol / एथेनॉल
C. Acetic acid / एसीटिक अम्ल
D. Water / जल
✔ Answer:
C. Acetic acid / एसीटिक अम्ल
Explanation:
Carboxylic acids are stronger acids due to resonance stabilisation of carboxylate ion.
Q7. Which reagent distinguishes aldehydes from ketones?
कौन-सा अभिकर्मक एल्डिहाइड व कीटोन में अंतर करता है?
A. Fehling’s solution / फेलिंग विलयन
B. NaOH
C. H₂SO₄
D. NH₃
✔ Answer:
A. Fehling’s solution / फेलिंग विलयन
Explanation:
Aldehydes reduce Fehling’s solution, ketones do not.
Q8. Which compound gives iodoform test?
आयोडोफॉर्म परीक्षण कौन-सा यौगिक देता है?
A. Methanal
B. Ethanal
C. Benzaldehyde
D. Formic acid
✔ Answer:
B. Ethanal / एथनाल
Explanation:
Ethanal contains CH₃–CO– group after oxidation and gives iodoform test.
Q9. The general formula of aldehydes is:
एल्डिहाइड का सामान्य सूत्र है:
A. CₙH₂ₙO
B. CₙH₂ₙ₊₂O
C. CₙH₂ₙO₂
D. CₙH₂ₙ₋₂O
✔ Answer:
A. CₙH₂ₙO
Explanation:
Open-chain aldehydes follow the formula CₙH₂ₙO.
Q10. Which acid is present in vinegar?
सिरके में कौन-सा अम्ल पाया जाता है?
A. Formic acid
B. Oxalic acid
C. Acetic acid
D. Citric acid
✔ Answer:
C. Acetic acid / एसीटिक अम्ल
Q11. Which aldehyde does NOT give Fehling’s test?
कौन-सा एल्डिहाइड फेलिंग परीक्षण नहीं देता है?
A. Acetaldehyde / एसीटैल्डिहाइड
B. Formaldehyde / फॉर्मल्डिहाइड
C. Benzaldehyde / बेंज़ाल्डिहाइड
D. Propanal / प्रोपनाल
✔ Answer:
C. Benzaldehyde / बेंज़ाल्डिहाइड
Explanation:
Aromatic aldehydes do not reduce Fehling’s solution.
Q12. The IUPAC name of acetone is:
एसीटोन का IUPAC नाम है:
A. Propan-1-one
B. Propan-2-one
C. Ethanal
D. Methanone
✔ Answer:
B. Propan-2-one
Explanation:
Carbonyl group is on second carbon → Propan-2-one.
Q13. Which acid is the strongest among the following?
निम्न में से सबसे प्रबल अम्ल कौन-सा है?
A. CH₃COOH
B. C₂H₅COOH
C. HCOOH
D. C₆H₅COOH
✔ Answer:
C. HCOOH / Formic acid
Explanation:
Formic acid has no electron-donating alkyl group, hence strongest.
Q14. Which compound gives silver mirror test?
कौन-सा यौगिक सिल्वर मिरर परीक्षण देता है?
A. Acetone
B. Ethanol
C. Benzaldehyde
D. Acetic acid
✔ Answer:
C. Benzaldehyde / बेंज़ाल्डिहाइड
Explanation:
Aldehydes give Tollens’ test (silver mirror).
Q15. Which functional group is present in ketones?
कीटोन में कौन-सा क्रियात्मक समूह होता है?
A. –CHO
B. –CO–
C. –COOH
D. –OH
✔ Answer:
B. –CO–
Explanation:
Ketones contain a carbonyl group bonded to two carbon atoms.
Q16. Which compound shows both acidic and reducing nature?
कौन-सा यौगिक अम्लीय व अपचायक दोनों होता है?
A. Acetic acid
B. Formic acid
C. Oxalic acid
D. Benzoic acid
✔ Answer:
B. Formic acid / फॉर्मिक अम्ल
Explanation:
Formic acid reduces Tollens’ reagent and is acidic.
Q17. Which reagent oxidises aldehydes to acids?
कौन-सा अभिकर्मक एल्डिहाइड को अम्ल में ऑक्सीकरण करता है?
A. NaOH
B. Fehling’s solution
C. Tollen’s reagent
D. Both B and C
✔ Answer:
D. Both B and C / दोनों
Explanation:
Both Fehling’s and Tollens’ reagents oxidise aldehydes.
Q18. Which compound does NOT give iodoform test?
कौन-सा यौगिक आयोडोफॉर्म परीक्षण नहीं देता है?
A. Ethanal
B. Acetone
C. Ethanol
D. Methanol
✔ Answer:
D. Methanol / मेथनॉल
Explanation:
Iodoform test requires CH₃–CO– or CH₃–CH(OH)– group.
Q19. The IUPAC name of HCOOH is:
HCOOH का IUPAC नाम है:
A. Methanoic acid
B. Ethanoic acid
C. Propanoic acid
D. Oxalic acid
✔ Answer:
A. Methanoic acid / मेथेनोइक अम्ल
Explanation:
One carbon carboxylic acid → Methanoic acid.
Q20. Which acid is present in ant sting?
चींटी के डंक में कौन-सा अम्ल पाया जाता है?
A. Acetic acid
B. Lactic acid
C. Formic acid
D. Citric acid
✔ Answer:
C. Formic acid / फॉर्मिक अम्ल
Explanation:
Ant sting contains formic acid.
Q21. Which compound undergoes nucleophilic addition reaction?
कौन-सा यौगिक न्यूक्लियोफिलिक योग अभिक्रिया करता है?
A. Alkanes
B. Alkenes
C. Aldehydes
D. Alkynes
✔ Answer:
C. Aldehydes / एल्डिहाइड
Explanation:
Polar C=O group favours nucleophilic addition.
Q22. Which group increases acidity of carboxylic acid?
कौन-सा समूह अम्लीयता बढ़ाता है?
A. –CH₃
B. –C₂H₅
C. –Cl
D. –OH
✔ Answer:
C. –Cl
Explanation:
Electron-withdrawing groups increase acidity.
Q23. Which acid is least acidic?
निम्न में से सबसे कम अम्लीय कौन-सा है?
A. HCOOH
B. CH₃COOH
C. C₂H₅COOH
D. C₆H₅COOH
✔ Answer:
C. C₂H₅COOH
Explanation:
Alkyl groups donate electrons and reduce acidity.
Q24. Which compound gives Cannizzaro reaction?
कौन-सा यौगिक कैनिज़ारो अभिक्रिया देता है?
A. Acetaldehyde
B. Formaldehyde
C. Acetone
D. Propanone
✔ Answer:
B. Formaldehyde / फॉर्मल्डिहाइड
Explanation:
Aldehydes without α-hydrogen give Cannizzaro reaction.
Q25. Which compound contains α-hydrogen?
किस यौगिक में α-हाइड्रोजन होता है?
A. Formaldehyde
B. Benzaldehyde
C. Acetaldehyde
D. Formic acid
✔ Answer:
C. Acetaldehyde / एसीटैल्डिहाइड
Explanation:
CH₃–CHO has α-hydrogen.
Q26. Which acid is aromatic?
कौन-सा अम्ल एरोमैटिक है?
A. Acetic acid
B. Oxalic acid
C. Benzoic acid
D. Formic acid
✔ Answer:
C. Benzoic acid / बेंज़ोइक अम्ल
Explanation:
Benzoic acid contains benzene ring.
Q27. Which reagent converts aldehyde to alcohol?
कौन-सा अभिकर्मक एल्डिहाइड को ऐल्कोहॉल में बदलता है?
A. KMnO₄
B. NaBH₄
C. Fehling’s solution
D. Tollen’s reagent
✔ Answer:
B. NaBH₄
Explanation:
NaBH₄ reduces aldehydes to primary alcohols.
Q28. Which compound gives fruity smell?
कौन-सा यौगिक फल जैसी गंध देता है?
A. Aldehyde
B. Ketone
C. Ester
D. Acid
✔ Answer:
C. Ester / एस्टर
Explanation:
Esters are responsible for fruity odour.
Q29. Which acid is used as food preservative?
कौन-सा अम्ल खाद्य संरक्षक के रूप में प्रयोग होता है?
A. Oxalic acid
B. Benzoic acid
C. Formic acid
D. Citric acid
✔ Answer:
B. Benzoic acid / बेंज़ोइक अम्ल
Explanation:
Benzoic acid inhibits microbial growth.
Q30. Which compound shows keto–enol tautomerism?
कौन-सा यौगिक कीटो-इनॉल टॉटोमेरिज़्म दर्शाता है?
A. Methanal
B. Acetaldehyde
C. Benzaldehyde
D. Formic acid
✔ Answer:
B. Acetaldehyde / एसीटैल्डिहाइड
Explanation:
Presence of α-hydrogen enables tautomerism.
Q31. Which acid forms soap with NaOH?
कौन-सा अम्ल NaOH के साथ साबुन बनाता है?
A. Acetic acid
B. Fatty acids
C. Formic acid
D. Oxalic acid
✔ Answer:
B. Fatty acids / वसीय अम्ल
Explanation:
Saponification of fatty acids produces soap.
Q32. Which compound has highest boiling point?
किसका क्वथनांक सबसे अधिक होता है?
A. Aldehyde
B. Ketone
C. Alcohol
D. Carboxylic acid
✔ Answer:
D. Carboxylic acid
Explanation:
Strong hydrogen bonding increases boiling point.
Q33. Which reagent converts carboxylic acid to acid chloride?
कौन-सा अभिकर्मक अम्ल को अम्ल क्लोराइड में बदलता है?
A. SOCl₂
B. NaBH₄
C. Zn/HCl
D. NaOH
✔ Answer:
A. SOCl₂
Explanation:
Thionyl chloride converts –COOH to –COCl.
Q34. Which compound does NOT show hydrogen bonding?
कौन-सा यौगिक हाइड्रोजन बॉन्डिंग नहीं दर्शाता?
A. Alcohol
B. Acid
C. Ketone
D. Aldehyde
✔ Answer:
C. Ketone / कीटोन
Explanation:
Ketones lack –OH group.
Q35. Which acid is dibasic?
कौन-सा अम्ल द्विआधारी है?
A. Formic acid
B. Acetic acid
C. Oxalic acid
D. Benzoic acid
✔ Answer:
C. Oxalic acid / ऑक्सैलिक अम्ल
Explanation:
Oxalic acid has two –COOH groups.
Q36. Which compound gives positive Schiff’s test?
कौन-सा यौगिक शिफ़ परीक्षण देता है?
A. Ketone
B. Aldehyde
C. Acid
D. Alcohol
✔ Answer:
B. Aldehyde / एल्डिहाइड
Explanation:
Schiff’s reagent detects aldehydes.
Q37. Which compound is used in silvering of mirrors?
शीशों की सिल्वरिंग में कौन-सा यौगिक प्रयोग होता है?
A. Acetone
B. Formaldehyde
C. Acetic acid
D. Ethanol
✔ Answer:
B. Formaldehyde / फॉर्मल्डिहाइड
Explanation:
Formaldehyde reduces Ag⁺ to Ag.
Q38. Which acid is present in curd?
दही में कौन-सा अम्ल पाया जाता है?
A. Acetic acid
B. Lactic acid
C. Citric acid
D. Formic acid
✔ Answer:
B. Lactic acid / लैक्टिक अम्ल
Explanation:
Curd contains lactic acid due to fermentation.
Q39. Which compound undergoes aldol condensation?
कौन-सा यौगिक ऐल्डोल संघनन करता है?
A. Benzaldehyde
B. Formaldehyde
C. Acetaldehyde
D. Formic acid
✔ Answer:
C. Acetaldehyde / एसीटैल्डिहाइड
Explanation:
α-Hydrogen is required for aldol reaction.
Q40. Which acid is used in photography?
फोटोग्राफी में कौन-सा अम्ल प्रयोग होता है?
A. Oxalic acid
B. Acetic acid
C. Citric acid
D. Formic acid
✔ Answer:
A. Oxalic acid / ऑक्सैलिक अम्ल
Explanation:
Oxalic acid is used as a reducing agent.
Q41. Which compound gives pungent smell?
कौन-सा यौगिक तीखी गंध देता है?
A. Ketone
B. Aldehyde
C. Acid
D. Ester
✔ Answer:
B. Aldehyde / एल्डिहाइड
Explanation:
Lower aldehydes have sharp pungent odour.
Q42. Which acid is tricarboxylic?
कौन-सा अम्ल त्रिकार्बोक्सिलिक है?
A. Oxalic acid
B. Malonic acid
C. Citric acid
D. Formic acid
✔ Answer:
C. Citric acid / साइट्रिक अम्ल
Explanation:
Citric acid has three –COOH groups.
Q43. Which reagent reduces carboxylic acid to alcohol?
कौन-सा अभिकर्मक अम्ल को ऐल्कोहॉल में बदलता है?
A. NaBH₄
B. LiAlH₄
C. KMnO₄
D. HNO₃
✔ Answer:
B. LiAlH₄
Explanation:
LiAlH₄ is a strong reducing agent.
Q44. Which compound shows resonance?
कौन-सा यौगिक अनुनाद दर्शाता है?
A. Aldehyde
B. Ketone
C. Carboxylate ion
D. Alcohol
✔ Answer:
C. Carboxylate ion / कार्बोक्सिलेट आयन
Explanation:
Negative charge is delocalised by resonance.
Q45. Which acid sublimes on heating?
कौन-सा अम्ल गर्म करने पर उर्ध्वपातन करता है?
A. Benzoic acid
B. Acetic acid
C. Oxalic acid
D. Formic acid
✔ Answer:
A. Benzoic acid / बेंज़ोइक अम्ल
Explanation:
Benzoic acid sublimes on heating.
Q46. Which compound is used as preservative for biological samples?
जैविक नमूनों के संरक्षण में कौन-सा यौगिक प्रयोग होता है?
A. Acetone
B. Formaldehyde
C. Ethanol
D. Methanol
✔ Answer:
B. Formaldehyde / फॉर्मल्डिहाइड
Explanation:
Formalin preserves tissues.
Q47. Which acid forms anhydride easily?
कौन-सा अम्ल आसानी से एनहाइड्राइड बनाता है?
A. Formic acid
B. Acetic acid
C. Benzoic acid
D. Oxalic acid
✔ Answer:
B. Acetic acid / एसीटिक अम्ल
Explanation:
Acetic acid forms acetic anhydride.
Q48. Which compound gives pleasant smell?
कौन-सा यौगिक सुगंधित गंध देता है?
A. Acid
B. Aldehyde
C. Ketone
D. Ester
✔ Answer:
D. Ester / एस्टर
Explanation:
Esters are fragrant compounds.
Q49. Which acid is present in lemon?
नींबू में कौन-सा अम्ल पाया जाता है?
A. Acetic acid
B. Lactic acid
C. Citric acid
D. Oxalic acid
✔ Answer:
C. Citric acid / साइट्रिक अम्ल
Explanation:
Lemon contains citric acid.
Q50. Which compound does NOT reduce Tollens’ reagent?
कौन-सा यौगिक टॉलेंस अभिकर्मक को अपचयित नहीं करता?
A. Formaldehyde
B. Acetaldehyde
C. Benzaldehyde
D. Acetone
✔ Answer:
D. Acetone / एसीटोन
Explanation:
Ketones do not give Tollens’ test.
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