Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs for Class 12 Chemistry

Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs for Class 12 Chemistry

Here students can practice Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs for Class 12 Chemistry. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the button. Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.

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Q 1.: In which of the following reactions new carbon-carbon bond is not formed ?

(A) Cannizaro reaction

(B) Aldol condensation

(C) Kolbe’s reaction

(D) Friedel Craft reaction

Option – A

Q 2.: The reagent used in Clemmensen’s reduction is

(A) Conc. H2SO4

(B) Mg-Hg / H2O

(C) Zn-Hg / Conc. HCl

(D) NH2-NH2 / KOH

Option – C

Q 3.: Which of the following does not give cannizaro’s reaction ?





Option – D

Q 4.: An organic compound ‘A’ burns with a sooty flame. It is negative towards Tollen’s reagent test and positive for Brady’s reagent test. The compound ‘A’ is

(A) Acetophenone

(B) Acetone

(C) Salicylic acid

(D) Benzaldehyde

Option – A

Q 5.: The reagent with which both acetaldehyde and acetone react is

(A) Fehling’s solution

(B) I2 / NaOH

(C) Tollen’s reagent

(D) Carbonic acid

Option – B

Q 6.: Which of the following reactions convert acetone into hydrocarbon having same number of carbon atoms ?

(A) Hofmann reaction

(B) Wolff-Kishner reaction

(C) Reduction with LiAlH4

(D) Reduction with Mg-Hg / H2O

Option – B

Q 7.: Which one of the following compounds do not give a primary alcohol on reduction ?

(A) Propanal

(B) Propanoic acid

(C) Methyl propanoate

(D) Propan-2-one

Option – D

Q 8.: Aldehydes and Ketones can be distinguished by

(A) Ammonia

(B) Alkaline KMnO4

(C) Fehling solution

(D) Acidified Potassium dichromate

Option – C

Q 9.: When ethanal is treated with Fehling’s solution, it gives a precipitate of

(A) Cu2O

(B) Cu

(C) CuO

(D) Both ‘A’ and ‘C’

Option – A

Q 10.: In the following reaction , ‘Y’ is

CH3-CO-CH2CH3  \( \xrightarrow[KOH]{~N_{2}H_{4}~}  \)  Y

(A) CH3-CH2-(CH3)C=N-NH2 

(B) CH3-CH2-CH2-CH3

(C) (CH3)2CH-NH2 

(D) CH3-CH(OH)-CH2-CH3 

Option – B

Q 11.: Identify the reaction which is used to obtain β-hydroxy ketone.

(A) Cannizaro reaction

(B) Condensation reaction

(C) Cross-cannizaro reaction

(D) Aldol condensation

Option – D

Q 12.: Formaldehyde react with ammonia to form

(A) Urotropine

(B) Methanamine

(C) Methanamide

(D) None of these

Option – A

Q 13.: Fehling A and Fehling B are

(A) CuSO4 solution and NH4OH solution

(B) CuSO4 solution and alkaline solution of sodium citrate

(C) CuSO4 solution and alkaline solution of sodium potassium tartarate

(D) CuSO4 solution and NaOH

Option – C

Q 14.: The compound, with which ethanal does not react, is

(A) HCl

(B) Cl2

(C) PCl5 

(D) Aqueous NaHSO3 

Option – A

Q 15.: The most reactive compound towards formation of  cyanohydrin on treatment with HCN followed by acidification is

(A) Benzaldehyde

(B) p-nitrobenzaldehyde

(C) Phenylacetaldehyde

(D) p-hydroxybenzaldehyde

Option – B

Q 16.: Which of the following will respond to Cannizaro’s reaction ?

(A) Acetaldehyde

(B) Propionaldehyde

(C) Cinnamaldehyde

(D) 2,2-dimethylpropanal

Option – D

Q 17.: Name the reagent used to bring about the following transformation ; But-2-ene to ethanal

(A) Acidified K2Cr2O7 

(B) CrO2Cl2 / H3O+


(D) O3 / H2O-Zn dust

Option – D

Q 18.: For making distinction between Pentan-2-one and pentan-3-one, the reagent to be employed is

(A) Tollen’s reagent

(B) Benedict solution

(C) NaOH / I2 / H+

(D) NaOH / NaI / H+ 

Option – C

Q 19.: Formaline is the commercial name of

(A) Formic acid

(B) Fluoroform

(C) para-formaldehyde

(D) 40% aqueous solution of formaldehyde

Option – D

Q 20.: Benzaldehyde condenses with N,N-dimethylaniline in presence of anhydrous ZnCl2 to give

(A) Malachite green

(B) Michler’s ketone

(C) Azo-dye

(D) Buffer yellow

Option – A

Q 21.: A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis form a racemic mixture of α-hydroxy acid. The carbonyl compound is

(A) Acetone

(B) Acetaldehyde

(C) Diethyl ketone

(D) Formaldehyde

Option – B

Q 22.: When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is

(A) Benzaldehyde

(B) Benzophenone

(C) Acetaldehyde

(D) Acetophenone

Option – D

Q 23.: Ketones react with Mg-Hg over water gives

(A) Alcohols

(B) Pinacols

(C) Hydrocarbons

(D) None of these

Option – B

Q 24.: The reagent used in Gattermann Koch aldehyde synthesis is

(A) Pb/BaSO4

(B) Acidified KMnO4 

(C) CO + HCl

(D) Zn-Hg / HCl

Option – C

Q 25.: Glacial acetic acid is obtained by

(A) Crystallising, separating and melting acetic acid

(B) Treating acetic acid with dehydrating agents

(C) Distilling acetic acid

(D) Chemically separating acetic acid

Option – A

Q 26.: When salicylic acid is distilled with Zn-dust, the product obtained is

(A) Benzoic acid

(B) Salicylaldehyde

(C) Zinc salicylate

(D) Phenol

Option – A

Q 27.: The product formed as a result of reaction of CH3MgBr and CO2 , on further hydrolysis gives

(A) Oxalic acid



(D) CH4

Option – C

Q 28.: Which of the following compound is more acidic ?





Option – D

Q 29.: Oleic, stearic and palmitic acids are

(A) Amino acids

(B) Fatty acids

(C) Nucleic acids

(D) None of these

Option – B

Q 30.: Silver salt of carboxylic acid on reaction with Br2/CCl4 gives

(A) Ester

(B) Alkyl halide

(C) Aldehyde

(D) Alcohol

Option – B

Q 31.: Silver salt of carboxylic acid on reaction with R–X gives

(A) Ester

(B) Alkyl halide

(C) Aldehyde

(D) Alcohol

Option – A

Q 32.: Propionic acid and KOH reacts to produce which one of the following

(A) Propyl alcohol

(B) Propionaldehyde

(C) Potassium propionate

(D) Propene

Option – C

Q 33.: The main product obtained in the reaction of acetamide and HNO2 is

(A) CH3-CN

(B) CH3-NC

(C) CH3-NH2


Option – D

Q 34.: Acid hydrolysis of which of the following compounds yields two different organic compounds ?



(C) CH3-COO-C2H5

(D) (CH3CO)2O

Option – C

Q 35.: Which of the following compounds when heated with CO at 150 0C and 500 atm pressure in presence of BF3 forms ethyl propionate ?

(A) C2H5-OH

(B) C2H5-O-C2H5

(C) CH3-O-CH3

(D) CH3-O-C2H5

Option – B

Q 36.: Self-condensation of two moles of ethyl acetate in the presence of sodium ethoxide yields

(A) Acetoacetic ester

(B) Ethyl Butyrate

(C) Methyl acetoacetate

(D) Ethyl propionate

Option – A

Q 37.: Methyl acetate and Ethyl acetate can be distinguished by

(A) Hot alkaline KMnO4

(B) Neutral FeCl3

(C) Iodoform test

(D) Silver mirror test

Option – C

Q 38.: Among the following which one does not act as an intermediate in Hofmann rearrangement ?




(D) R-NC

Option – D

Q 39.: Which reaction is used for the preparation of acetophenone ?

(A) Reimer-Tiemann reaction

(B) Wurtz-fitting reaction

(C) Friedel-Craft’s reaction

(D) Cannizaro’s reaction

Option – C

Q 40.: Waxes are ester of

(A) Glycerol

(B) Long chain alcohols and long chain fatty acids

(C) Long chain alcohols

(D) Glycerol and fatty acid

Option – B


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We hope that these Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs for Class 12 Chemistry helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs for Class 12 Chemistry, click on the question range given above.

Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.