Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQ Questions with Answers

Class 12 Aldehyde Ketone and Carboxylic Acid MCQ Questions are one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ on Aldehydes Ketones and Carboxylic acids class 12 which will help them all through their board test.

Class 12 Aldehyde Ketone and Carboxylic Acid MCQ Questions with Answers

Class 12 Chemistry MCQ with answers are given here to chapter the Aldehyde Ketone and Carboxylic Acid . These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQ, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

Learn Class 12 Chemistry Aldehydes Ketones and Carboxylic Acids MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 12 Aldehyde Ketone and Carboxylic Acid MCQ with answers given below.

Question 1. Ketones [RCOR₁] where R = R₁ = alkyl group. It can be obtained in one step by     
(a) oxidation of tertiary alcohol
(b) reaction of acid halide with alcohols
(c) hydrolysis of esters
(d) oxidation of primary alcohol.

 Question 2.Which one of the following can be oxidised to the corresponding carbonyl compound?   
(a) 2-Hydroxypropan
(b) ortho-Nitrophenol
(c) Phenol
(d) 2-Methyl-2-hydroxypropane

 Question 3. In the reaction, CH₃CN + 2H → ^HCl Ether → X→ ^{Boiling H2OY}; the term Y is    
(a) acetaldehyde
(b) ethanamine
(c) acetone
(d) dimethylamine.

 Question 4. Which of the following reagents would distinguish cis-cyclopenta-1,2-diol from the trans-isomer?     
(a) MnO₂
(b) Aluminium isopropoxide
(c) Acetone
(d) Ozone

 
Question 5. The oxidation of toluene to benzaldehyde by chromyl chloride is called     
(a) Etard reaction
(b) Riemer–Tiemann reaction
(c) Wurtz reaction
(d) Cannizzaro’s reaction.

Question 6. Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as     
(a) Aldol condensation
(b) Cannizzaro’s reaction
(c) Cross Cannizzaro’s reaction
(d) Cross Aldol condensation.

 Question 7. CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by     
(a) Benedict’s test
(b) iodoform test
(c) Tollens’ reagent test
(d) Fehling’s solution test. 

Question 8. Consider the reaction : RCHO + NH₂NH₂ → RCH=N — NH₂ What sort of reaction is it?     
(a) Electrophilic addition-elimination reaction
(b) Free radical addition-elimination reaction
(c) Electrophilic substitution-elimination reaction
(d) Nucleophilic addition-elimination reaction

Question 9. Which of the following compounds will give a myellow precipitate with iodine and alkali?     
(a) Acetophenone
(b) Methyl acetate
(c) Acetamide
(d) 2-Hydroxypropane

 Question 10. The correct statement regarding a carbonyl compound with a hydrogen atom on its alphacarbon, is     
(a) a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation
(b) a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism
(c) a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol
(d) a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration

 Question 11. The product formed by the reaction of an aldehyde with a primary amine is     
(a) carboxylic acid
(b) aromatic acid
(c) Schiff ’s base
(d) ketone.

 Question 12. Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is     
(a) hydrazine in presence of feebly acidic solution
(b) hydrocyanic acid
(c) sodium hydrogen sulphite
(d) a Grignard reagent.

Question 13. A strong base can abstract an a-hydrogen from   
(a) ketone
(b) alkane
(c) alkene
(d) amine.

Question 14. Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called   
(a) Cope reduction
(b) Dow reduction
(c) Wolff–Kishner reduction
(d) Clemmensen reduction. 

 Question 15. Clemmensen reduction of a ketone is carried out in the presence of which of the following?      
(a) Glycol with KOH
(b) Zn-Hg with HCl
(c) LiAlH₄
(d) H₂ and Pt as catalyst

 Question 16. Which of the following reactions will not result in the formation of carbon-carbon bonds?   
(a) Reimer–Tiemann reaction
(b) Cannizzaro reaction
(c) Wurtz reaction
(d) Friedel–Crafts acylation

Question 17. Which of the following can be used to differentiate between aldehyde and ketone?
(a) Ammoniacal AgNO₃
(b) Ammoniacal AgNO₃ in the presence oftartarate ion
(c) I₂ in the presence of base
(d) Ammoniacal AgNO₃ in the presence of citrate ion       

Question 18. A compound X undergoes reduction with LiAIH₄ to yield Y . When vapours of Yare passed over freshly reduced copper at 300° C, X is formed. What is Y? 
(a) CH₃COCH₃
(b) CH₃CHO
(c) CH₃CH₂OH
(d) CH₃OCH₃   

Question 19. The product formed in the aldol condensation of acetaldehyde is
(a) CH₃CH₂CH(OH)CHO
(b) CH₃CH(OH)CH₂CHO
(c) CH₃CH(OH)COCH₃
(d) CH₃CH₂CH₂CHO       

 Question 20. The product formed in aldol condensation is A
(a) a beta-hydroxy aldehyde or a beta-hydroxy ketone    
(b) an alpha-hydroxy aldehyde or ketone
(c) an alpha, beta unsaturated ester
(d) a beta-hydroxy acid. 

Question 21. Aldo! condensation is given by 
(a) trimethyl acetaldehyde
(b) acetaldehyde
(c) benzaldehyde
(d) formaldehyde       

Question 22. Which of the following will form two isomers with semi carbazide ? 
(a) Benzaldehyde
(b) Acetone
(c) Benzoquinone
(d) Benzophenone         

Question 23. In the reaction
CH₃COOH →^LiAIH₄ A →^PCl₅ B →^Ale.KOH C, the product C is 
(a) acetaldehyde
(b) acetylene
(c) ethylene
(d) acetyl chloride   

Question 24. The reaction of an organic compound with ammonia followed by nitration of the product gives a powerful explosive, called RDX. The organic compound is
(a) phenol
(b) toluene 
(c) glycerine
(d) formaldehyde       

Question 25. Which of the following does not give Fehling solution test? 
(a) Acetone
(b) Propanal
(c) Ethanal
(d) Butanal     

Question 26. Which of the product is formed when acetone is reacted with barium hydroxide solution?

Question 27. The correct increasing order of the acid strength ofbenzoic acid (I), 4-nitrobenzoic acid (II), 3, 4-dinitrobenzoic acid  (III) and 4methoxybenzoic acid (IV) is 
(a) I < II < III < IV
(b) II < I < IV < III
(c) IV < I < II < III
(d) IV < II < I < III
(e) I < IV < II < III       

Question 28. Identify Din the following reaction 

(a) HOOC—CH₂—COOH
(b) OHC—CH₂—COOH
(c) OHC—CH₂—CHO
(d) HO—CH=CH—COOH

Question 29. A liquid was mixed with ethanol and a drop of concentrated H₂SO₄ was added. A compound with a fruity smell was formed. The liquid was 
(a) CH₃OH
(b) HCHO
(c) CH₃COCH₃
(d) CH₃COOC₂H₅ 

Question 30. 2-pentanone and 3-petanone can be distinguished by
(a) Cannizzaro’s reaction
(c) Iodoform reaction reduction
(b) Aldo! condensation
(d) Clemmensen’s         

Question 31. Sodium phenoxide when heated with CO₂ under pressure at 125°C yields a product which on acetylation producesC. 

Question 32. Vinegar is dilute aqueous solution of
(a) ethanoic acid
(b) benzoic acid
(c) citric acid
(d) oxalic acid       

Question 33. Which one of the following acid does not have a carboxylic group? 
(a) Methanoic acid
(b) Ethanoic acid
(c) Propanoic acid
(d) Picric acid       

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Question 34. What product is formed when cyclohexanone is oxidised?
(a) HOOC. (CH₂)₄ · COOH 
(b) CH₃CH₂COOH
(c) CH₃(CH₂)₄COOH
(d) None of the above       

Question 35. Identify the method by which Me₃CCO₂H can be prepared. 
(a) Treating 1 mole of MeCO Me with 2 moles of MeMgI
(b) Treating 1 mole of MeCO₂ Me with 3 moles of MeMgI
(c) Treating 1 mole of MeCHO with 3 moles of MeMgI
(d) Treating 1 mole of dry ice with 1 mole of Me₃CMgI       

Question. 36

(a) hydroxy nitrite
(c) cyanohydrin
(b) hydroxy cyanide
(d) hydroxy isocyanide     

Question 37. The compound that undergoes decarboxyliation most readily under mild condition is 

Question 38. Among the following compounds, the one(s) that gives (give) effervescence with aqueous NaHCO₃ solution is (are) 
(CH₃CO)₂ OCH₃COOHPhOHCH₃COCHO
          I              II       III         IV
(a) I and II
(b) I and III
(c) Only II
(d) 1 and IV     

Question 39. Which acid is present in vinegar? 
(a) Formic acid
(b) Acetic acid
(c) Butyric acid
(d) Tartaric acid   

Question 40. Which one of the following is an Hell-Volhard-Zelinsky reaction?

(a)

(d)

Question 41. The strongest acid amongst the following compounds is
(a) CH₃COOH
(b) HCOOH 
(c) CH₃CH₂CH(Cl)CO₂H
(d) ClCH₂CH₂CH₂COOH       

Question 42. Benzaldehyde on refluxing with aqueous alcoholic KCN produce 
(a) cyanobenzene
(b) cyanohydrin
(c) benzoyl cyanide
(d) benzoin       

Question 43. Which of the following is incorrect?   
(a) FeCl₃ is used in detection of phenol.
(b) Fehling solution is used in detection of glucose.
(c) Tollens’ reagent is used in detection of unsaturation.
(d) NaHSO₃ is used in detection of carbonyl compound. 

Question 44. Polarisation in acrolein can be described as   
(a) ^+δCH₂=CH — ^+δCHO
(b) ^-δCH₂₌ CH — ^+δCHO 
(c) ^-δCH₂₌ CH — CHO^+δ 
(d) ^+δCH= CH — CHO^-δ

Question 45. A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of a-hydroxy acid. The carbonyl compound is   
(a) formaldehyde
(b) acetaldehyde
(c) acetone
(d) diethyl ketone. 

Question 46. In this reaction : CH₃CHO + HCN → CH₃CH(OH)CN →^HOH CH₃CH(OH)COOH an asymmetric centre is generated. The acid obtained would be   
(a) D-isome
(b) L-isomer
(c) 50% D + 50% L-isomer
(d) 20% D + 80% L-isomer.

Question 47. Iodoform test is not given by   
(a) ethanal
(b) ethanol
(c) 2-pentanone
(d) 3-pentanone. 

Question 48. Phenylmethanol can be prepared by reducing the benzaldehyde with   
(a) CH₃Br and Na
(b) CH₃I and Mg
(c) CH₃Br
(d) Zn and HCl. 

Question 49. The oxidation of toluene with CrO₃ in the presence of (CH₃CO)₂O gives a product A, which on treatment with aqueous NaOH produces   
(a) C₆H₅COONa
(b) 2, 4-diacetyl toluene
(c) C₆H₅CHO
(d) (C₆H₅CO)₂O

Question 50. First product of the reaction between RCHO and NH₂NH₂ is   
(a) RCH NNH₂
(b) RCH NH
(c) RCH₂NH₂
(d) RCON₃ 

Question 51. An ester (A) with molecular formula, C₉H₁₀O₂ was treated with excess of CH₃MgBr and the complex so formed, was treated with H₂SO₄ to give an olefin (B). Ozonolysis of (B)  ave a ketone with molecular formula C₈H₈O which shows +ve iodoform test. The structure of (A) is     
(a) H₃CCH₂COC₆H₅
(b) C₂H₅COOC₆H₅
(c) C₆H₅COOC₂H₅
(d) p-H₃CO – C₆H₄ – COCH₃

Question 52. Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?   
(a) CH C — CHO
(b) CH₂ CHCHO
(c) C₆H₅CHO
(d) CH₃CH₂CHO

Question 53. Which of the following compounds will give positive test with Tollens’ reagent?   
(a) Acetic acid
(b) Acetone
(c) Acetamide
(d) Acetaldehyde

 Question 54. (CH₃)₂C= CHCOCH₃ can be oxidised to (CH₃)₂C=CHCOOH by   
(a) chromic acid
(b) NaOI
(c) Cu at 300°C
(d) KMnO₄ 

Question 55. When aniline reacts with oil of bitter almonds (C₆H₅CHO) condensation takes place and benzal derivative is formed. This is known as   
(a) Schiff ’s base
(b) Benedict’s reagent
(c) Millon’s base
(d) Schiff ’s reagent. 

Question 56. Compound A has a molecular formula C₂Cl₃OH. It reduces Fehling’s solution and on oxidation, it gives a monocarboxylic acid B. If A is obtained by the action of chlorine on ethyl  lcohol, then compound A is   
(a) methyl chloride
(b) monochloroacetic acid
(c) chloral
(d) chloroform. 

Question 57. In which of the following, the number of carbon atoms does not remain same when carboxylic acid is obtained by oxidation?   
(a) CH₃COCH₃
(b) CCl₃CH₂CHO
(c) CH₃CH₂CH₂OH
(d) CH₃CH₂CHO

Question 58. The reagent which can be used to distinguish acetophenone from benzophenone is   
(a) 2,4-dinitrophenylhydrazine
(b) aqueous solution of NaHSO₃
(c) Benedict reagent
(d) I2 and NaOH.

Question 59. If formaldehyde and KOH are heated, then we get   
(a) methane
(b) methyl alcohol
(c) ethyl formate
(d) acetylene.

Question 60. Acetaldehyde reacts with   
(a) electrophiles only
(b) nucleophiles only
(c) free radicals only
(d) both electrophiles and nucleophiles.

Question 61. Which of the following compounds gives benzoic acid on hydrolysis?   
(a) Chlorobenzene
(b) Benzoyl chloride
(c) Chlorophenol
(d) Chlorotoluene

Question 62. The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is   
(a) B > A > D > C
(b) B > D > C > A
(c) A > B > C > D
(d) A > C > B > D 

Question 63. An organic compound A on treatment with NH3 gives B, which on heating gives C. C when treated with Br₂ in the presence of KOH produces ethyl amine. Compound A is   
(a) CH₃COOH
(b) CH₃CH₂CH₂COOH
(c) CH₃— CHCOOH                 ι
              CH₃
(d) CH₃CH₂COOH

Question 64. Which of the following represents the correct order of the acidity in the given compounds?   
(a) FCH₂COOH > CH₃COOH > BrCH₂COOH > ClCH₂COOH
(b) BrCH₂COOH > ClCH₂COOH > FCH₂COOH > CH₃COOH
(c) FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH
(d) CH₃COOH > BrCH₂COOH > ClCH₂COOH > FCH₂COOH

Question 65. Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their   
(a) formation of intramolecular H-bonding
(b) formation of carboxylate ion
(c) more extensive association of carboxylic acid via van der Waals’ forces of attraction
(d) formation of intermolecular H-bonding.

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