Students of class 12 Chemistry should refer to MCQ Questions Class 12 Chemistry Aldehydes Ketones and Carboxylic Acids with answers provided here which is an important chapter in Class 12 Chemistry NCERT textbook. These MCQ for Class 12 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 12 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 12 Chemistry examination

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

MCQ Questions Class 12 Chemistry Aldehydes Ketones and Carboxylic Acids provided below have been prepared by expert teachers of grade 12. These objective questions with solutions are expected to come in the upcoming Standard 12 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Two compounds benzyl alcohol and benzoic acid are formed from this compound, when this compound is heated in the presence of conc.NaOH, this compound is.
(a) Benzaldehyde
(b) Benzylalcohol
(c) Acetophenone
(d) Benzophenone

Question. The reagent which does not react with both, acetone and benzaldehyde is 
(a) Sodium hydrogensulphite
(b) Phenyl hydrazine
(c) Fehling’s solution
(d) Grignard reagent

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

Question. Iodoform test is not given by
(a) 2-Pentanone
(b) Ethanol
(c) Ethanal
(d) 3-Pentanone

Question. Addition of water to alkynes occurs in acidic medium and in the presence of Hg2+ ions as a catalyst. Which of the following products will be formed on addition of water to but-1-yne under these condition?

Question. When acetaldehyde reacts with alcohol then produce
(a) Acetal
(b) Ketal
(c) Acetone
(d) None

Question. The reagent which does not react with both, acetone and benzaldehyde.
(a) Sodium hydrogensulphite
(b) Phenyl hydrazine
(c) Fehling’s solution
(d) Grignard reagent

Question. The formation of cyanohydrin from propanone is which type of reaction?
(a) Electrophilic substitution
(b) Nucleophilic substitution
(c) Electrophilic addition
(d) Nucleophilic addition

Question. Wolf-Kishner reduction is
(a) reduction of carbonyl compound into alcohol
(b) reduction of carbonyl compound into alkene
(c) reduction of carboxyl compound into alkane
(d) reduction of nitro compound into aniline

(a) Prop–1–en–2–ol, metamerism
(b) Prop–1–en–1–ol, tautomerism
(c) Prop–2–en–2–ol, geometrical isomerism
(d) Prop–1–en–2–ol, tautomerism

Question. Imine derivatives of aldehyde and ketone is called as
(a) Schiff’s reagent
(b) Fehling’s reagent
(c) Schiff’s base
(d) Schiff’s acid

Question. The acid formed when propyl magnesium bromide is treated with CO₂ is :
(a) C₃H₇COOH
(b) C₂H₅COOH
(c) both
(d) None of these

Question. Which one of the following reagents is used for the conversion of ethanoic acid to ethanoic anhydride?
(a) P₂O₅, Δ
(b) SOCl₂, Δ
(c) PCl₃, Δ
(d) both (a) and (b)

Question. Primary and secondary alcohols on action of reduced copper give
(a) Aldehydes and ketones respectively
(b) Ketones and aldehydes respectively
(c) Only aldehydes
(d) Only ketones

Question. Which of the following compounds is most reactive towards nucleophilic addition reactions?

Question. The oxidation of toluene to benzaldehyde by chromyl chloride is called
(a) Rosenmund reaction
(b) Wurtz reaction
(c) Etard reaction
(d) Fittig reaction

Question. Which of the following compounds will give brisk effervescence of CO₂ on treatment with NaHCO₃?
(a) Phenol
(b) Acetic acid
(c) both
(d) None of these

Question. IUPAC name of ethyl isopropyl ketone is
(a) 4-methyl pent-3-one
(b) 2-methyl pent-3-one
(c) 4-methyl pent-2-one
(d) 2-methyl pent-2-one

Question. The 􀁓-bond in carbonyl group is formed by
(a) s-s-overlapping
(b) p-p-overlapping
(c) s-p-overlapping
(d) p-d-overlapping

(a) identical
(b) positional isomers
(c) functional isomers
(d) optical isomers

Question. Which one of the following on oxidation gives a ketone ?
(a) Primary alcohol
(b) Secondary alcohol
(c) Tertiary alcohol
(d) All of these

Question. Liquid obtained by distillation of red ant is 
(a) formaline
(b) formaldehyde
(c) formic acid
(d) formyl chloride   

Question. Who has synthesised the organic compound ‘w·ea’ for the first time? 
(a) Friedrich Wohler
(b) Berzelius
(c) Kolbe
(d) Berthelot     

Question. Which compound is responsible for perfumery?
(a) Ketones
(b) Ethers 
(c) Alcohols
(d) Esters   

Question. Colouration of Br₂/CCI₄ will be discharged by 
(a) cinnamic acid
(b) benzoic acid
(c) o-phthalic acid
(d) acetophenone   

Question. Oil of winter green is 
(a) a carboxylic acid
(b) an alcohol
(c) a ketone
(d) an ester       

Question. Acetic acid will be obtained on oxidation of 
(a) ethanol
(b) propanal
(c) methanal
(d) glyoxal     

Question. C6H5COOH →(i) NH3 (ii)Δ p →NaOBr Q →(i) Cone. H2SO4 (ii) Heat of 460 K R R is 
(a) o-bromo sulphanilic acid
(b) sulphanilamide
(c) sulphanillic acid
(d) p-bromo sulphanilamide     

Question. In the given reaction, identify compound C.

Question. Acetic anhydride is prepared in the laboratory by heating sodium acetate with 
(a) ethyl chloride
(b) acetyl chloride
(c) cone. H₂SO₄
(d) zinc dust       

Question. In the reaction

Question. Sodium ethoxide has reacted with ethanoyl chloride. The compow1d that is produced in the above reaction is
(a) diethyl ether
(b) 2-butanone 
(c) ethyl chloride
(d) ethyl ethanoate       

Question. Identify Zin the sequence,
CH₃COONH₄ →^Δ X →_Δ^P₂O₅ →^H₂O/H+ Z 
(a) CH₃CH₂CONH₂
(b) CH₃CN 
(c) CH₃COOH
(d) (CH₃CO)₂O       

Question. Potassium cyanate is heated with ammonium sulphate. The product formed is
(a) urea
(b) ammonia
(c) potassium sulphate
(d) ammonium cyanide   

Question. Give IUPAC name of the product, when acetamide is heated with anhydrous phosphorus pentoxide. 
(a) Ethyl atnine
(b) Propane nitrile
(c) Cyano methane
(d) Ethane nitrile       

Question. Which one of the following will undergo meta-substitution on monochlorination? 
(a) Ethoxybenzene
(b) Chlorobenzene
(c) Ethyl benzoate
(d) Phenol       

Question. When acetamide is hydrolysed by boiling with acid, the product obtained is 
(a) acetic acid
(b) ethyl amine
(c) ethanol
(d) acetamide   

Question. Ethyl acetate is obtained when methyl magnesium bromide reacts with 
(a) ethyl formate
(b) ethyl chloroformate
(c) acetyl chloride
(d) carbon dioxide     

Question. When acetamide is treated with Br₂ and caustic soda, the product formed is
(a) N-brommide
(b) bromoacetic acid
(c) methanamine
(d) ethanamine     

Question. 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) gave a ketone with molecular formula C₈H₈O which shows positive iodoform test. The structure of (A) is 
(a) C₆H₅COOC₂H₅ 
(b) C₆H₅COOC₆H₅
(c) C₆H₅COOCH₃
(d) p-H₃CO—C₆H₄—COCH₃     

Question. The most suitable reagent A, for the reaction

is/are
(a) O₃
(b) H₂O₂
(c) NaOH-H₂O₂
(d) m-chloroperbenzoic acid   

Question. Which of the following will produce only one product on reduction with LiAlH₄ ? 
(a) C₂H₅COOCH₂CH₃
(b) CH₃CH₂COOCH₂CH₃
(c) CH₃COOC₂H₅
(d) CH₃COOCH₂CH₂CH₃       

Question. Which one of the following pairs gives effervescence with aqueous NaHCO₃ ?
CH₃COCI (I) 
CH₃COCH₃ (II)
CH₃COOCH₃ (III) 
CH₃COOCOCH₃ (IV)
(a) I and II
(b) I and IV
(c) II and III
(d) I and III       

Question. Which of the following diacid readily gives anhydride on heating ? 
(a) Fumaric
(b) Maleic acid
(c) Malic acid
(d) Terephthalic acid   

Question. Hydroxamic acid test is employed to detect 
(a) ketones
(b) aldehydes
(c) esters
(d) amides     

Question. The product formed in the reaction n-hexanamide +Br² +KOH, is
(a) hexanamine
(b) propanamine
(c) butanamine
(d) pentanamine     

Question. (CH₂CO)₂O + RMgX →^H₂O? 
(a) ROOC(CH₂ )COOR
(b) RCOCH₂CH₂COOH
(c) RCOOR
(d) RCOOH     

Question. Which of the following compounds will give butanone on oxidation with alkaline KMnO4 solution?
(a) Butan-1-ol
(b) Butan-2-ol
(c) Both of these
(d) None of these

Question. Which of the following compounds will give butanone on oxidation with alkaline KMnO₄ solution?
(a) Butan-1-ol
(b) Butan-2-ol
(c) Both of these
(d) None of these

Question. An aldehyde group can be present
(a) in between carbon chain
(b) at any position in carbon atom
(c) only at the end of carbon chain
(d) at the second carbon atom of the carbon chain

(a) Tollens’ reagent
(b) Benzoyl peroxide
(c) I2 and NaOH solution
(d) Sn and NaOH solution

Question. Acetaldehyde reacts with
(a) Electrophiles only
(b) Nucleophiles only
(c) Free radicals only
(d) Both electrophiles and nucleophiles

Question. Carbonyl compounds undergo nucleophilic addition because of
(a) electronegativity difference of carbon and oxygen atoms
(b) electromeric effect
(c) more stable anion with negative charge on oxygen atom and less stable carbonium ion
(d) None of the above

Question. Which of the following contain an aldehyde?
(a) Vanilla beans
(b) Meadow sweet
(c) Cinnamon
(d) All of these

Question. Which of the following have pleasant smell?
(a) Methanal
(b) Propanal
(c) Ethanal
(d) Hexanal

Question. Which one of the following can be oxidised to the corresponding carbonyl compound?
(a) 2-hydroxy-propane
(b) Ortho-nitrophenol
(c) Phenol
(d) 2-methyl-2 hydroxy-propane

Question. Which of the following compounds do not undergo aldol condensation?

Question. Which of the following statement is false ?
(a) Cannizzaro reaction is given by aldehydes in presence of alkali
(b) Aldol condensation is given by aldehydes in presence of alkali
(c) Aldol condensation is given by aldehydes and ketones in presence of acids
(d) None of the above

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

Question. Iodoform test is not given by
(a) 2-Pentanone
(b) Ethanol
(c) Ethanal
(d) 3-Pentanone

Question. Which of the following is not used in the preparation of ketone?
(a) Oxidation of secondary alcohols
(b) Dehydrogenation of 2° alcohol
(c) Pyrolysis of calcium acetate
(d) Acid hydrolysis of alkyl cyanide

Question. Cannizzaro’s reaction is not given by _.

Question. Which of the following is used to prepare ketone from acyl chloride ?
(a) R-MgX
(b) R2Cd
(c) CO + HCl
(d) CrO3

Question. What is formed when a primary alcohol undergoes catalytic dehydrogenation ?
(a) Aldehyde
(b) Ketone
(c) Alkene
(d) Acid

Question. The correct order of increasing acidic strength is _____________. 
(a) Phenol < Ethanol < Chloroacetic acid < Acetic acid
(b) Ethanol < Phenol < Chloroacetic acid < Acetic acid
(c) Ethanol < Phenol < Acetic acid < Chloroacetic acid
(d) Chloroacetic acid < Acetic acid < Phenol < Ethanol

Question. The weakest acid among the following is:
(a) CHCl₂COOH
(b) CH₃COOH
(c) CH₂ClCOOH
(d) CCl₃COOH

Question. Which of the following forces explain the boiling point of aldehydes and ketones?
(a) Hydrogen bonding
(b) van der Waal’s forces
(c) Dipole-dipole attraction
(d) None of these

Question. Which is highly soluble in water?
(a) Methanal
(b) Propanal
(c) Propanone
(d) Butanone

Question. Which reaction is used for detecting the presence of carbonyl group?
(a) Reaction with hydrazine
(b) Reaction with phenyl hydrazine
(c) Reaction with hydroxylamine
(d) All of the above

Question. The product formed in Aldol condensation is
(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. The product obtained by the reaction of an aldehyde and hydroxylamine is
(a) hydrazone
(b) aldoxime
(c) primary amine
(d) alcohol

(a) B < C < A < D
(b) A < B < C < D
(c) C < B < D < A
(d) C < D < B < A

Question. Schiff’s reagent gives pink colour with
(a) acetaldehyde
(b) acetone
(c) acetic acid
(d) methyl acetate

We hope the above multiple choice questions for Class 12 Chemistry for Chapter 12 Aldehydes Ketones and Carboxylic Acids provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Aldehydes Ketones and Carboxylic Acids is an important chapter in Class 12 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 12 students. Please go through these and let us know if you have any feedback in the comments section.