MCQ Questions Chapter 12 Aldehydes Ketones and Carboxylic Acids Class 12 Chemistry

Please refer to MCQ Questions Chapter 12 Aldehydes Ketones and Carboxylic Acids Class 12 Chemistry with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 12 Chemistry issued for the current academic year. We have provided MCQ Questions for Class 12 Chemistry for all chapters on our website. Students should learn the objective based questions for Chapter 12 Aldehydes Ketones and Carboxylic Acids in Class 12 Chemistry provided below to get more marks in exams.

Chapter 12 Aldehydes Ketones and Carboxylic Acids MCQ Questions

Please refer to the following Chapter 12 Aldehydes Ketones and Carboxylic Acids MCQ Questions Class 12 Chemistry with solutions for all important topics in the chapter.

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

Question. Which reaction is used for the preparation of acetophenone? 
(a) Reimer-Tiemann reaction
(b) Wurtz-Fittig reaction
(c) Friedel-Craft’s reaction
(d) Cannizaro’s reaction     

Question. Which of the following compounds will give positive iodoform test with I₂ and NaOH? 
(a) C₆H₅COCC₆H₅
(b) CH₃CH₂CHO
(c) C₆H₅COCH₂CH₃
(d) C₆H₅—CH—CH₃
                l
               OH     

Question. The compound C₆H₅CH = N—N = CHC₆H₅ is produced by the reaction of an excess of benzaldehyde with which compound? 
(a) NH₃
(b) NH₂NH₂
(c) Hydroxyl amine
(d) Phenyl hydrazine       

Question. The reagent used in Gatte1mann Koch aldehyde synthesis is
(a) Pb/BaSO₄ 
(b) alkaline KMnO₄
(c) acidic KMnO₄
(d) CO + HCl       

Question. X →_(Reductive)^Ozonolysis Y + Z      
Y can be obtained by Etard’s reaction, Z undergoes disproportionation reaction with concentrated alkali. X could be

Question. When CH₂ = CH—O—CH₂—CH₃ reacts with one mole of HI, one of the products formed is 
(a) ethane
(b) ethanol
(c) iodoethene
(d) ethanal     

Question. HCHO was treated with a reagent X . The product formed upon hydrolysis in the presence of an acid gave C₂H₅ OH The reagent X is 
(a) alcoholic KOH
(b) alcoholic KCN
(c) CH₃MgI
(d) aqueous KOH   

Question. Upon treatment with AI(OEt)₃ followed by usual reactions (work up) CH₃CHO will produce 
(a) Only CH₃COOCH₂CH₃
(b) a mixture of CH₃COOH and EtOH
(c) Only CH₃COOH
(d) Only EtOH   

Question. Acetophenone cannot be prepared easily starting from
(a) C₆H₅CH(OH)CH₃
(b) C₆H₅CH₃ 
(c) C₆H₅C= CH
(d) C₆H₆ 

Question. Which of the following, compounds is the reactant in Rosenmund’s reduction?
(a) CH₃CO₂H
(b) CH₃CHO
(c) CH₃CH₂Cl
(d) CH₃COCl       

Question. In the given transformation, which of the following is the most appropriate reagent? 

(a) NH₂NH₂ , OH
(b) Zn—Hg/HCI
(c) Na, Liq. NH₃
(d) NaBH₄       

Question. How many enols (including stereo isomers) exist for 3-hexanone?
(a) Two
(b) Three
(c) Four
(d) Six       

Question. What will be the order of reactivity of the following carbony I compounds with Grignard’ s reagent? 

(a) I > II > III > IV
(c) II > I > IV> III
(b) IV > III > II > I
(d) III > II > I > IV         

Question. What will be the product/s ifbenzyl chloride is heated with a concentrated aqueous KOH solution? 
(a) Benzaldehyde
(b) Benzoic acid
(c) Benzyl alcohol and sodium benzoate
(d) An aldol     

Question. Which set of products is expected on reductive ozonolysis of the following di olefin?
              CH₃
                l
CH₃CH = C—CH= CH₂
(a) CH₃CHO; CH₃COCH = CH₂
(b) CH₃CH = C(CH₃ )CHO; CH₂O
(c) CH₃CHO; CH₃COCHO;CH₂O
(d) CH₃CHO; CH₃COCH₃ ; CH₂O   

Question. By combining the two calcium salts of carboxylic acids we are preparing 2-butanone. Find the correct pair from the following.
(a) Calcium formate + calcium propanoate
(b) Calcium acetate + calcium propanoate 
(c) Calcium acetate + calcium acetate
(d) Calcium formate + calcium acetate     

Question. Which of the following on heating with aqueous KOH, produces acetaldehyde? 
(a) CH₃COCl
(b) CH₃CH₂CI
(c) CH₂ClCH₂CI
(d) CH₃CHCI₂   

Question. When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is
(a) acetophenone
(b) benzaldehyde
(c) benzophenone
(d) acetaldehyde     

Question. The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is
(a) methanal
(b) propanal
(c) propanone
(d) ethanal     

Question. The compound which forms acetaldehyde when heated with dilute NaOH, is 
(a) 1, 1-dicholoroethane
(b) 1, 1, 1 -trichloroethane
(c) 1-chloroethane
(d) 1, 2-dichloroethane     

Question. The most suitable reagent for the conversion of
R—CH₂—OH→ R—CHO is
(a) KMnO₄
(b) K₂Cr₂O₇
(c) CrO₃
(d) PCC (pyridinium chlorochromate)   

Question. Shown below are four possible synthesis of propionaldehyde. Which one would not work?

Question. 

Identify the reactant.
(a) H₂O
(b) HCHO
(c) CO
(d) CH₃CHO       

Question. The product P in the reaction, 

Question. Stephen’s reduction is used to prepare aldehyde from
(a) alcohol
(b) alkyl cyanides 
(c) alkanones
(d) acid chlorides       

Question. 3-pentanol on reaction with aluminium tertiary butoxide in the presence of acetone gives
(a) 3-pentanal
(b) 2-pentanal
(c) 3-pentanone
(d) 2-pentanone       

Question. The reagents to carry out the following conversion are

(a) HgSO₄ / dil. H₂SO₄
(b) BH₃ ; H₂O₂/Na0H
(c) OsO₄ ; HIO₄
(d) NaNH₂/CH₃I; HgSO₄ /dil. H₂SO₄   

Question. 

The above ketone will not be formed by
(a) reaction of benzene and acetyl chloride in the presence of AlCl₃
(b) reaction of acetonitrile with phenyl magnesium bromide in ether followed by hydrolysis
(c) treatment ofacetyl chloride with dibenzyl cadmium
(d) addition of water to phenyl acetylene in the presence of mercuric sulphate and dilute sulphuric acid.   

Question. The reaction of H₂ is given below
H₂ + CO+ R—CH = CH₂ →
R—CH₂—CH₂—CHO is specifically called as
(a) hydrogenation
(b) reduction 
(c) hydroformylation
(d) dehydration
(e) formylation     

Question. 

Question. Which one of the following product is formed when calcium salt of adipic acid is heated? 

Question. When calcium acetate is distilled, it will produce which of the following compound? 
(a) CH₃COOH
(b) CH₃CHO
(c) CH₃COCH₃
(d) All of these       

Question. Calcium formate on distillation gives 
(a) HCOOH
(b) CH₃COOH
(c) CH₃CHO
(d) HCHO     

Question. The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is
(a) pyridinium chlorochromate
(b) chromic anhydride in glacial acetic acid
(c) acidic di chromate
(d) acidic permanganate     

Question. The major product in the following reaction is 

Question. How many chiral centre are possible for the product of following reaction? 

(a) 1
(b) 0
(c) 3
(d) 2       

Question. Arrange the following compounds in the increasing order of nucleophilic addition reaction 
I. HCHO
II. CH₃COCH₃
III. C₆H₅COCH₃
IV. C₆H₅CO₆H₅
(a) I < II < III < IV
(b) IV < III < II < I
(c) IV < II < III < I
(d) III < IV < II < I     

Question. Silver min-or test is given by which one of the following compounds?
(a) Acetaldehyde
(b) Acetone
(c) Formaldehyde
(d) Benozophenone       

Question. Which of the following statements is not true for acetaldehyde? 
(a) It will undergo an aldol condensation reaction
(b) It will undergo a Cannizaro reaction
(c) It will undergo a haloform reaction
(d) Enolisation is catalysed by acid or base       

Question. 

The IUPAC name of B is
(a) 3-methylbutan-2-ol
(b) 2-methylbutan-3-ol
(c) 2-methylbutan-2-ol
(d) pentan-2-ol         

Question. The catalyst used in Rosenmund reaction is 
(a) Zn/Hg
(b) Pd/BaSO₄
(c) Raney Ni
(d) Na in ethanol     

Question. Which one of the following can be oxidised to the coITesponding carbonyl compound? 
(a) 2-hydroxypropane
(b) ortho-nitrophenol
(c) Phenol
(d) 2-methyl-2-hydroxypropane       

Question. The compound of molecular formula C₅H₁₀O(A) reacts will Tollen’s reagent to give silver minor but does not undergo aldol condensation. The compound A is
(a) 3-pentanone 
(b) 2, 2-dimethylpropanal
(d) 3-methylbutanal
(e) 3-methyl-2-butanone     

Question. The intermediate J in the following Wittig reaction is

Question. Which of the following process is used for the preparation of acetone? 
(a) Haber’s process
(b) Wacker’s process
(c) Wolff-Kishner reaction
(d) Gatterman-Koch synthesis     

Question. An organic compound ‘A’ burns with a sooty flame. It is neagtive towards Tollen’s reagent test and positive for Brady’s reagent test. The compound ‘A’ is 
(a) Acetophenone
(b) Acetone
(c) Salicylic acid
(d) Bezaldehyde   

Question. The order of compounds in their reactivity towards HCN is 
(a) acetaldehyde < ketone < methyl tert-butyl ketone < di-tert-butyl ketone
(b) di-tert-butyl ketone < methyl tert-butyl ketone < acetone < acetaldehyde
(c) di-tert-butyl ketone < acetone < methyl tert-butyl ketone < acetaldehyde
(d) Acetone < acetaldehyde < di-tert-butyl ketone < methyl tert-butyl ketone   

Question. Which of the following does not give Cannizzaro’s reaction? 
(a) CCI₃CHO
(b) C₆H₅CHO
(c) HCHO
(d) CH₃CHO     

Question. In the following reaction, the product E is

Question. The major product of the following reaction is

(a) a hemiacetal
(b) an acetal
(c) an ether
(d) an ester     

Question. Reactivity towards nucleophilic addition reaction of
I. HCHO
II. CH₃CHO
III. CH₃COCH₃ is
(a) II > III > I
(b) III > II > I
(c) I > II > III
(d) I > III > II        

Question. What kind of isomerism is exhibited by the compounds CH₃CH₂CHO and CH₃COCH₃?
(a) Geometrical isomerism
(b) Functional isomers
(c) Tautomers
(d) Metamers       

Question. Trichloroacetaldehyde was subjected to Cannizzaro’s reaction by using NaOH. The mixture of the products contains sodium trichloroacetate ion and another compound. The other compound is 
(a) 2, 2, 2-trichlorethanol
(b) trichloromethanol
(c) 2, 2, 2-trichloropropanol
(d) chloroform       

Question. An organic compounds with the molecular formula C₈H₈O forms 2, 4-DNP derivative, reduces Tollen’s reagent and undergoes Cannizaro reaction. On vigorous oxidation, it gives 1, 2-benzenedicarboxylic acid. The organic compound is 
(a) 2-ethylbenzaldehyde
(b) 2-methylbenzaldehyde
(c) acetophenone
(d) 3-methylbenzaldehyde
(e) phenylacetaldehyde   

Question. Among the following structures the one which is not a resonating stmcture of others is

(a) Only I
(b) Only II
(c) Only III
(d) Only IV       

Question. In the scheme given below, the total number of intramolecular aldol condensation products formed from ‘Y’ is

(a) 1
(b) 2
(c) 3
(d) 4       

Question. The reagent with which both acetaldehyde and acetone react is 
(a) Fehling’s solution
(b) I₂ /NaOH
(c) Tollen’s reagent
(d) carbonic acid       

Question. An important industrial solvent, also a laboratory reagent, called 2-butanone, is nothing but 
(a) methyl ethyl ketone
(b) dimethyl ketone
(c) diethyl ketone
(d) propyl ketone
(e) methyl propyl ketone     

Question. The number of aldol reaction(s) that occurs in the given transformation is 

(a) 1
(b) 2
(c) 3
(d) 4         

Question. What type of compound is shown below?
                  O
                  ll
            H—C—CH₂—CH₃ 
(a) An alcohol
(c) A ketone
(b) An aldehyde
(d) None of these     

Question. When a mixture of calcium acetate and calcium formate is dry distilled, the product formed as
(a) ethanal
(b) butanone
(c) methanal
(d) acetophenone   

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

Question. Carbonyl compounds are constituents of 
(a) fabrics, drugs
(b) fabrics, plastics
(c) flavourings, plastics
(d) All of the above   

Question. After completion of the reactions (I and II), the organic compound(s) in the reaction mixtures is 

(a) Reaction I P and Reaction II P
(b) Reaction I U, acetone and Reaction II Q, acetone
(c) Reaction I T, U acetone and Reaction II P
(d) Reaction I R acetone and reaction II S acetone   

Question. Oxidation of aldehydes gives 
(a) esters
(b) acids
(c) ethers
(d) alcohols
(e) esters and acids     

Question. Which of the following gives an aldehyde on dry distillation? 
(a) Calcium formate + calcium acetate
(b) Calcium acetate + calcium benzoate
(c) Calcium acetate
(d) Calcium benzoate     

Question. Collin’s reagent is used to convert
(a) C = O → CHOH
(b) —CH₂OH→ CHO
(c) —CHO→ —COOH
(d) —CHO→ —CH₂OH     

Question. lodoform can be prepared form all except
(a) ethyl methyl ketone
(b) iso-propyl alcohol
(c) 3-methyl-2-butanone
(d) iso-buty1 alcohol     

Question. Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid? 
(a) Phenol
(b) Benzaldehyde
(c) Butanal
(d) Benzoic acid       

Question. Among H—CHO,CH₃CHOand C₆H₅CHO, which will undergo Cannizzaro’s reaction? 
(a) HCHO and CH₃—CHO
(b) CH₃—CHO and C₆H₅CHO
(c) C₆H₅CHO and HCHO
(d) All of the above   

Question. The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits 
(a) geometrical isomerism
(b) optical isomerism
(c) neither optical nor geometrical isomerism
(d) both optical and geometrical isomerism     

Question. Reaction of formaldehyde and ammonia gives 
(a) hexamethylene tetramine
(b) bakelite
(c) urea
(d) triethylene tetramine     

Question. Identify the combination of compounds that undergo aldol condensation followed by dehydration to produce but-2-enal 
(a) methanal and ethanal
(b) two moles of ethanal
(c) methanal and propanone
(d) ethanol and propanone
(e) two moles of ethanol     

Question. Which of the following organic compounds answers both iodoform test and Fehling’s test? 
(a) Methanal
(b) Ethanol
(c) Propane
(d) Ethanal         

Question. Which of the following reactions convert acetone into hydrocarbon having same number of carbon atoms?
(a) Wolff-Kishner reaction 
(b) Hofmann reaction
(c) Grignard reaction
(d) Reduction with LiAIH₄       

Question. When acetaldehyde is heated with dilute sodium hydroxide solution, the product is
(a) ethanol and sodium acetate
(b) paraldehyde
(c) aldol
(d) brown resin         

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