Please refer to Chapter 12 Aldehydes Ketones and Carboxylic Acids MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter Aldehydes Ketones and Carboxylic Acids and then attempt the following objective questions.

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

Aldehydes Ketones and Carboxylic Acids MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The IUPAC name of CH₃COCH(CH₃)₂ is
(a) 2-methyl-3-butanone
(b) 4-methylisopropyl ketone
(c) 3-methyl-2-butanone
(d) Isopropylmethyl ketone

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

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. The catalyst used in Rosenmund’s reduction is
(a) HgSO₄
(b) Pd/BaSO₄
(c) anhydrous AlCl₃
(d) anhydrous ZnCl₂

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

Question. Benzophenone can be converted into benzene by using
(a) fused alkali
(b) anhydrous AlCl₃
(c) sodium amalgam in water
(d) acidified dichromate

Question. In > C = O group sigma bond is formed by
(a) sp²-p-overlapping
(b) sp³-p-overlapping
(c) sp-p-overlapping
(d) s-p-overlapping

Question. Aldehydes and ketones are generally reduced by :
(a) Clemmensen reduction
(b) H₂S
(c) H₂ / Ni
(d) None of these

Question. Benzaldehyde can be prepared by oxidation of toluene by
(a) Acidic KMnO₄
(b) K₂Cr₂O₇ / H⁺
(c) CrO₂Cl₂
(d) All of these

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 aldehyde cannot be obtained by Rosenmund’s reaction?
(a) CH₃CHO
(b) HCHO
(c) CH₃CH₂CHO
(d) All of these

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

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

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

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

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

Question. Which gives lactic acid on hydrolysis after reacting with HCN ?
(a) HCHO
(b) CH₃CHO
(c) C₆H₅CHO
(d) CH₃COCH₃

Question. Aldehydes and ketones are distinguished by which of the following test ?
(a) Lucas test
(b) Tollen’s test
(c) KMnO₄ solution (Baeyer’s test)
(d) None of these

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

Question. Which of the following compound will show positive silver mirror test ?
(a) HCOOH
(b) CH₃ (CHOH)₃CHO
(c) CH₃CO(CHOH)CH₃
(d) Both (a) and (b)

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

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. Benzaldehyde reacts with ethanoic KCN to give
(a) C₆H₅CHOHCN
(b) C₆H₅CHOHCOC₆H₅
(c) C₆H₅CHOHCOOH
(d) C₆H₅CHOHCHOHC₆H₅

Question. When acetaldehyde is heated with Fehling’s solution it gives a precipitate of
(a) Cu
(b) CuO
(c) Cu₂O
(d) Cu(OH)₂

Question. 2-pentanone and 3-pentanone can be distinguished by :
(a) Cannizaro’s reaction
(b) Aldol condensation
(c) Iodoform reaction
(d) Clemmensen’s reduction

Question. Cross aldol condensation occurs between
(a) two same aldehydes
(b) two same ketones
(c) two different aldehydes and ketones
(d) None of these

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. A compound does not react with 2, 4-dinitrophenylhydrazine, the compound is :
(a) Acetone
(b) Acetaldehdye
(c) CH₃OH
(d) CH₃CH₂COCH₃

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

Question. Acetone reacts with iodine (I2) to form iodoform in the presence of
(a) CaCO₃
(b) NaOH
(c) KOH
(d) MgCO₃

Question. (CH₃)₃C–CHO does not undergo aldol condensation due to
(a) three electron donating methyl groups
(b) cleavage taking place between —C— CHO bond
(c) absence of alpha hydrogen atom in the molecule
(d) bulky (CH₃)₃C—group

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

Question. Ketone upon treatment with Grignard Reagent gives
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) aldehyde

Question. Propanal and propanone, both have same molecular formula(C₃H₆O), what do you expect about their boiling points?
(a) Both have same boiling point
(b) Boiling point of propanal is higher than the boiling point of propanone.
(c) Boiling point of propanal is lower than the boiling point of propanone
(d) Nothing can be predicted

Question. Less reactivity of ketone is due to
(a) + I inductive effect decrease positive charge on carbonyl carbon atom
(b) steric effect of two bulky alkyl groups
(c) sp² hybridised carbon atom of carbonyl carbon atom
(d) Both (a) and (b)

Question. The most appropriate reagent to distinguish between acetaldehyde and formaldehyde is :
(a) Fehling’s solution
(b) Tollen’s reagent
(c) Schiff’s reagent
(d) Iodine in presence of base

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

Question. Which of the following products is formed when benzaldehyde is treated with CH3MgBr and the addition product so obtained is subjected to acid hydrolysis ?
(a) A secondary alcohol
(b) A primary alcohol
(c) Phenol
(d) tert-Butyl alcohol

Question. 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) I2and Na₂CO₃

Question. Aldol condensation would not occur in :
(a) CH₃COCH₃
(b) CH₃CH₂CHO
(c) HCHO
(d) CH₃CHO

Question. Aldehydes can be oxidised by :
(a) Tollen’s reagent
(b) Fehling solution
(c) Benedict solution
(d) All 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. 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. The product obtained by the reaction of an aldehyde and hydroxylamine is
(a) hydrazone
(b) aldoxime
(c) primary amine
(d) alcohol

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

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

We hope you liked the above Aldehydes Ketones and Carboxylic Acids MCQ Class 12 Chemistry. In case you have any questions please put them in the comments box below and our teachers will provide you a response.