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Aldehydes, Ketones and Carboxylic Acids WBCHSE Class 12 MCQ & Practice Questions

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Aldehydes, Ketones and Carboxylic Acids Revision Guide for WBCHSE Class 12 Chemistry

Aldehydes, Ketones and Carboxylic Acids is part of WBCHSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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  • Important equations or relationships
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  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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Top 20 Aldehydes, Ketones and Carboxylic Acids MCQs with Answers

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WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

1. Aldehyde-এর functional group?

  • A. –CHO
  • B. >C=O between carbons
  • C. –COOH
  • D. –OH
Answer: A
Explanation: Aldehyde-এ terminal carbonyl group –CHO থাকে।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

2. Ketone-এর functional group?

  • A. –CHO
  • B. R–CO–R′
  • C. –COOH
  • D. –CN
Answer: B
Explanation: Ketone-এ carbonyl carbon দুই carbon group-এর সঙ্গে যুক্ত।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

3. Carboxylic acid-এর functional group?

  • A. –COOH
  • B. –CHO
  • C. –OR
  • D. –NH2
Answer: A
Explanation: Carboxyl group –COOH carboxylic acid-এর characteristic group।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

4. Aldehyde ketone-এর তুলনায় nucleophilic addition-এ সাধারণত বেশি reactive কেন?

  • A. কম steric hindrance ও কম +I effect
  • B. more resonance donation always
  • C. ionic bond
  • D. no carbonyl
Answer: A
Explanation: Aldehyde-এ একটি alkyl/H substituent থাকায় steric ও electron donation ketone-এর তুলনায় কম।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

5. Tollens reagent-এর সঙ্গে aldehyde কী দেয়?

  • A. Silver mirror
  • B. Blue precipitate
  • C. Purple gas
  • D. No reaction always
Answer: A
Explanation: Aldehyde Ag(I) diammines complex-কে metallic silver-এ reduce করে।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

6. Fehling solution aliphatic aldehyde-এর সঙ্গে কী দেয়?

  • A. Brick-red Cu2O precipitate
  • B. Ag mirror
  • C. Green gas
  • D. No change
Answer: A
Explanation: Aliphatic aldehyde Cu2+ কে Cu2O-তে reduce করে brick-red precipitate দেয়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

7. Ketone সাধারণত Tollens test দেয়?

  • A. হ্যাঁ সব
  • B. না, সাধারণ ketone দেয় না
  • C. শুধু acetone silver mirror
  • D. always explosive
Answer: B
Explanation: Ordinary ketones mild Tollens oxidant দ্বারা oxidized হয় না, তাই negative।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

8. Ethanal oxidation-এ কী দেয়?

  • A. Ethanol
  • B. Ethanoic acid
  • C. Ethene
  • D. Methane
Answer: B
Explanation: Aldehyde সহজে corresponding carboxylic acid-এ oxidized হয়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

9. Propanone reduction-এ কী দেয়?

  • A. Propan-1-ol
  • B. Propan-2-ol
  • C. Propanoic acid
  • D. Propene
Answer: B
Explanation: Ketone carbonyl reduction secondary alcohol দেয়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

10. Ethanal reduction-এ কী দেয়?

  • A. Ethanol
  • B. Methanol
  • C. Ethanoic acid
  • D. Ethene
Answer: A
Explanation: Aldehyde reduction corresponding primary alcohol দেয়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

11. HCN addition to carbonyl compound-এ product কী?

  • A. Cyanohydrin
  • B. Ether
  • C. Ester
  • D. Amide
Answer: A
Explanation: CN− nucleophilic attack ও protonation-এ α-hydroxynitrile/cyanohydrin গঠন হয়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

12. Aldol condensation-এর জন্য aldehyde/ketone-এ কী দরকার?

  • A. α-Hydrogen
  • B. halogen only
  • C. no carbonyl
  • D. aromatic ring only
Answer: A
Explanation: Enolate/enol formation-এর জন্য অন্তত একটি α-H প্রয়োজন।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

13. Cannizzaro reaction কোন aldehyde-এ অনুকূল?

  • A. α-H যুক্ত aldehyde
  • B. α-H বিহীন aldehyde
  • C. সব ketone
  • D. carboxylic acid
Answer: B
Explanation: Non-enolizable aldehydes concentrated base-এ disproportionation (alcohol + carboxylate) করে।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

14. Formaldehyde Cannizzaro reaction দেয় কেন?

  • A. α-H নেই
  • B. two α-H আছে
  • C. ketone
  • D. acid
Answer: A
Explanation: HCHO-তে carbonyl carbon-এর পাশে কোনো α-carbon/H নেই।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

15. Iodoform test methyl ketone-এর জন্য কেন positive?

  • A. CH3CO– unit iodination/cleavage-এ CHI3 দেয়
  • B. Ag formed
  • C. CO2 formed
  • D. NaCl formed
Answer: A
Explanation: Methyl ketone alkaline iodine-এ exhaustive α-iodination ও cleavage করে yellow CHI3 precipitate দেয়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

16. Acetone iodoform test দেয়?

  • A. হ্যাঁ
  • B. না
  • C. শুধু acid medium
  • D. শুধু gas phase
Answer: A
Explanation: Acetone CH3COCH3 methyl ketone, তাই positive iodoform test।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

17. Carboxylic acid alcohol-এর তুলনায় বেশি acidic কেন?

  • A. Carboxylate ion resonance-stabilized
  • B. alcohol ionic
  • C. acid no O-H
  • D. alcohol stronger resonance
Answer: A
Explanation: Conjugate base RCOO−-এ charge দুই oxygen-এ resonance-delocalized।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

18. Electron-withdrawing substituent carboxylic acid acidity কী করে?

  • A. বাড়ায়
  • B. কমায় সবসময়
  • C. কোন effect নেই
  • D. acidকে base করে
Answer: A
Explanation: −I effect carboxylate negative charge stabilize করে acidity বাড়ায়।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

19. CH3COOH + C2H5OH/H+ → ?

  • A. Ethyl ethanoate + H2O
  • B. Ethanal + CH4
  • C. Ether only
  • D. Ethene
Answer: A
Explanation: Fischer esterification-এ carboxylic acid + alcohol ⇌ ester + water।

WBCHSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

20. Carboxylic acid + NaHCO3-এ কোন gas বের হয়?

  • A. H2
  • B. CO2
  • C. O2
  • D. Cl2
Answer: B
Explanation: RCOOH bicarbonate-কে protonate করে CO2 effervescence দেয়।

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Aldehydes, Ketones and Carboxylic Acids Practice Tests

Aldehydes, Ketones and Carboxylic Acids Frequently Asked Questions

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