CBSE Class 12 Chemistry Aldehydes Ketones and Carboxylic Acids MCQs Set 01

Download CBSE MCQs for Class 12 Chemistry: Unit 8 Aldehydes Ketones and Carboxylic Acids

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Chapter-wise Objective Questions: Unit 8 Aldehydes Ketones and Carboxylic Acids

Access the complete set of multiple-choice questions for Unit 8 Aldehydes Ketones and Carboxylic Acids below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

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

Answer : C


Question : Which is highly soluble in water?

(a) Methanal  
(b) Propanal
(c) Propanone
(d) Butanone

Answer : A


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

Answer : C


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)

Answer : D


Question : Acetaldehyde reacts with

(a) Electrophiles only
(b) Nucleophiles only
(c) Free radicals only
(d) Both electrophiles and nucleophiles

Answer : B

 

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

Answer : C

 

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

Answer : D

 

Question : If formaldehyde and KOH are heated, then we get

(a) methane       
(b) methyl alcohol
(c) ethyl formate
(d) acetylene

Answer : B

 

Question : Aldehydes can be oxidised by :

(a) Tollen’s reagent 
(b) Fehling solution
(c) Benedict solution
(d) All the above

Answer : D

 

Question : 2-pentanone and 3-pentanone can be distinguished by :

(a) Cannizaro's reaction
(b) Aldol condensation
(c) Iodoform reaction   
(d) Clemmensen's reduction

Answer : C 

 

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
Answer : B
 
 
Question : Schiff’s reagent gives pink colour with
(a) acetaldehyde 
(b) acetone
(c) acetic acid
(d) methyl acetate
Answer : A
 
 
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
Answer : C
 
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
Answer : B
 
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
Answer : A
 
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
Answer : B
 
Question : Which of the following contain an aldehyde?
(a) Vanilla beans
(b) Meadow sweet
(c) Cinnamon
(d) All of these
Answer : D
 
Question : Which of the following have pleasant smell?
(a) Methanal
(b) Propanal
(c) Ethanal
(d) Hexanal
Answer : D
 
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
Answer : A
 
Question : Which one of the following on oxidation gives a ketone ?
(a) Primary alcohol
(b) Secondary alcohol
(c) Tertiary alcohol
(d) All of these
Answer : B
 
Question : What is formed when a primary alcohol undergoes catalytic ehydrogenation ?
(a) Aldehyde
(b) Ketone
(c) Alkene
(d) Acid
Answer : A
 
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
Answer : A
 
Question : Which of the following does not represent the natural source of the corresponding acids ?
(a) Formic acid : Red ant
(b) Acetic acid : Vinegar
(c) Butyric acid : Rancid butter
(d) Isobutyric acid : Automobile exhausts 
Answer : D
 
Question : The catalyst used in Rosenmund's reduction is
(a) HgSO4
(b) Pd/BaSO4
(c) anhydrous AlCl3
 (d) anhydrous ZnCl2
Answer : B
 
Question : Vinegar is a solution of acetic acid which is :
(a) 15 – 20%
(b) 20 –25%
(c) 6 – 8% 
(d) 2 – 4%
Answer : C
 
 
Question : Benzaldehyde can be prepared by oxidation of toluene by
(a) Acidic KMnO4
(b) K2Cr2O7 / H+
(c) CrO2Cl2
(d) All of these
Answer : C
 
Question : The oxidation of toluene to benzaldehyde by chromyl chloride is called
(a) Rosenmund reaction
(b) Wurtz reaction
(c) Etard reaction
(d) Fittig reaction
Answer : C
 
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
Answer : C
 
Question : Methyl cyanide can be converted into acetic acid by one of the following reactions.
(a) Reduction 
(b) Hydrolysis
(c) Electrolysis
(d) Decarboxylation
Answer : B
 
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
Answer : D
 
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
Answer : D
 
Question : The difference between aldol condensation and Cannizzaro’s reaction is that:
(a) the former takes place in the presence of -H-atom.
(b) the former takes place in the absence of -H-atom.
(c) the former takes place in the presence of -H-atom.
(d) none of the above
Answer : A
 
Question : The product obtained by the reaction of an aldehyde and hydroxylamine is
(a) hydrazone 
(b) aldoxime
(c) primary amine
(d) alcohol
Answer : B
 
Question : Ketone upon treatment with Grignard Reagent gives
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol 
(d) aldehyde
Answer : C
 
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
Answer : A
 
Question : Benzophenone can be converted into benzene by using
(a) fused alkali
(b) anhydrous AlCl3
(c) sodium amalgam in water
(d) acidified dichromate
Answer : A
 
 
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
Answer : C
 
Question : Which is highly soluble in water?
(a) Methanal
(b) Propanal
(c) Propanone
(d) Butanone
Answer : A
 
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
Answer : C
 
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)
Answer : D
 
Question : Acetaldehyde reacts with
(a) Electrophiles only
(b) Nucleophiles only
(c) Free radicals only
(d) Both electrophiles and nucleophiles
Answer : B
 
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
Answer : C
 
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
Answer : B
 
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 : 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
Answer : C
 
Question : Acetone reacts with iodine (I2) to form iodoform in the presence of
(a) CaCO3
(b) NaOH
(c) KOH
(d) MgCO3
Answer : B
 
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
Answer : C
 
Question : Tollen’s reagent is
(a) ammonical CuSO4
(b) ammonical AgNO3
(c) alkaline solution containing complex of copper nitrate
(d) none of these
Answer : B
 
Question : Iodoform test is not given by
(a) 2-Pentanone
(b) Ethanol
(c) Ethanal
(d) 3-Pentanone
Answer : D
 
Question : Phenylmethyl ketone can be converted into ethylbenzene in one step by which of the following reagents?
(a) LiAlH4
(b) Zn-Hg/HCl
(c) NaBH4
(d) CH3MgI
Answer : B
 
Question : When acetaldehyde is heated with Fehling’s solution it gives a precipitate of
(a) Cu
(b) CuO
(c) Cu2O
(d) Cu(OH)2
Answer : C
 
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
Answer : C
 
Question : Which of the following pairs of compounds will undergo aldol and Cannizzaro reaction respectively ?
(i) acetone; benzaldehyde
(ii) acetaldehyde; butan–2–one
(iii) propanone; formaldehyde.
(iv) cyclopentanone, benzaldehyde
(a) (i), (ii) and (iii) (b) (ii) and (iii)
(c) (ii), (iii) and (iv) (d) (iii) and (iv)
Answer : A
 
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)
Answer : D
 
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
Answer : B
 
Question : Aldehydes and ketones are generally reduced by :
(a) Clemmensen reduction
(b) H2S
(c) H2 / Ni
(d) None of these
Answer : A
 
Question : In which reaction, > C = O can be reduced to > CH2?
(a) Wolf-Kishner reaction
(b) Reimer-Tiemann reaction
(c) Wurtz reaction
(d) None of these 
Answer : A
 

Question : Which of the following contain an aldehyde?

(a) Vanilla beans
(b) Meadow sweet
(c) Cinnamon    
(d) All of these

Answer : D

 

Question : Which of the following have pleasant smell?

(a) Methanal
(b) Propanal
(c) Ethanal  
(d) Hexanal

Answer : D


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

Answer : A

 

Question : Which one of the following on oxidation gives a ketone ?

(a) Primary alcohol 
(b) Secondary alcohol
(c) Tertiary alcohol
(d) All of these

Answer : B


Question : What is formed when a primary alcohol undergoes catalytic dehydrogenation ?

(a) Aldehyde
(b) Ketone
(c) Alkene   
(d) Acid

Answer : A


Question : Primary and secondary alcohols on action of reduced coppergive

(a) Aldehydes and ketones respectively
(b) Ketones and aldehydes respectively
(c) Only aldehydes
(d) Only ketones

Answer : A

 

Question : The oxidation of toluene to benzaldehyde by chromyl chloride is called

(a) Rosenmund reaction
(b) Wurtz reaction
(c) Etard reaction        
(d) Fittig reaction

Answer : C


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

Answer : C

 

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

Answer : D

 

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

Answer : C

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