JEE Chemistry Aldehydes Ketones and Carboxylic Acids MCQs Set B

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) Phenol
(c) A primary alcohol
(d) tert-Butyl alcohol

Answer: A

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

Answer: A

Question.  The compound that neither forms semicarbazone nor oxime is
(a) CH₃CONHCH₃
(b) CH₃COCH₂Cl
(c) HCHO
(d) CH₃CHO

Answer: A

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

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

Answer: A

Question. Tollen’s reagent is
(a) ammonical AgNO₃
(b) ammonical CuSO₄
(c) alkaline solution containing complex of copper nitrate
(d) none of these

Answer: A

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

Answer: A

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

Answer: A

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), (iii) and (iv)
(c) (ii) and (iii)
(d) (iii) and (iv)

Answer: A

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) Benzophenone
(d) Acetophenone

Answer: A

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

Answer: A

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

Answer: A

Question. Which of the following does not represent the natural source of the corresponding acids ?
(a) Isobutyric acid : Automobile exhausts
(b) Butyric acid : Rancid butter
(c) Acetic acid : Vinegar
(d) Formic acid : Red ant

Answer: A

Question. Vinegar is a solution of acetic acid which is :
(a) 6 – 8%
(b) 15 – 20%
(c) 20 –25%
(d) 2 – 4%

Answer: A

Question. Methyl cyanide can be converted into acetic acid by one of the following reactions
(a) Hydrolysis
(b) Decarboxylation
(c) Electrolysis
(d) Reduction

Answer: A

Question. Toluene can be oxidised to benzoic acid by
(a) KMnO₄ (alk.)
(b) K₂Cr₂O₇ (alk.)
(c) Both
(d) None of these

Answer: A

Question. Select the acid(s) which cannot be prepared by Grignard reagent
(a) Formic acid
(b) Acetic acid
(c) Succinic acid
(d) All of the above

Answer: A

Question. Lower carboxylic acids are soluble in water due to
(a) hydrogen bonding
(b) easy hydrolysis
(c) low molecular weight
(d) dissociation into ions

Answer: A

Question. Dimerisation of carboxylic acids is due to
(a) intermolecular hydrogen bond
(b) coordinate bond
(c) covalent bond
(d) ionic bond

Answer: A

Question. Boiling points of carboxylic acids are
(a) higher than corresponding alcohols
(b) equal to that of corresponding alcohols
(c) lower than corresponding alcohols
(d) None of the above

Answer: A

Question. In the anion HCOO^– the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
(a) The anion HCOO^– has two reasonating structures
(b) The anion is obtained by removal of a proton from the acid molecule
(c) The C=O bond is weaker than the C–C bond
(d) Electronic orbitals of carbon atom are hybridised

Answer: A

Question. Carboxylic acids are more acidic than phenol and alcohol because of
(a) resonance stabilization of their conjugate base
(b) highly acidic hydrogen
(c) formation of dimers
(d) intermolecular hydrogen bonding

Answer: A

Question. Which of the following has the maximum acidic strength ?
(a) o- nitrobenzoic acid
(b) p-nitrobenzoic acid
(c) m-nitrobenzoic acid
(d) p-nitrophenol

Answer: A

Question. Which of the following acids has the smallest dissociation constant ?
(a) BrCH₂CH₂COOH
(b) CH₃CHFCOOH
(c) FCH₂CH₂COOH
(d) None of these

Answer: A

Question. Which one of the following esters is obtained by the esterification of propan-2-ol with ethanoic acid ?
(a) CH₃COOCH(CH₃)₂
(b) (CH₃)₂CHCOOCH₃
(c) CH₃COOCH₂CH₃
(d) None of these

Answer: A

Question. The major product of nitration of benzoic acid is
(a) 3- Nitrobenzoic acid
(b) 2- Nitrobenzoic acid
(c) 4- Nitrobenzoic acid
(d) 2, 4- dinitrobenzoic acid

Answer: A

Question.  Among the following acids which has the lowest pKa value?
(a) HCOOH
(b) CH₃CH₂COOH
(c) CH₃COOH
(d) None of these

Answer: A

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

Answer: A

Question. Which reagent can convert acetic acid into ethanol ?
(a) LiAIH₄ + ether
(b) Sn + HCl
(c) Na + alcohol
(d) H₂ + Pt

Answer: A

Question. Which is false in case of carboxylic acids?
(a) Which is false in case of carboxylic acids?
(b) They have higher b.p. than corresponding alcohols
(c) They form H-bonds
(d) They are polar molecules

Answer: A

Question. The elimination of CO₂ from a carboxylic acid is known as
(a) decarboxylation
(b) hydration
(c) dehydration
(d) carboxylation

Answer: A

Question. The reaction of carboxylic acid gives effervescences of CO₂ with NaHCO₃. The CO₂ comes from
(a) NaHCO₃
(b) None of these
(c) R – COOH
(d) Both

Answer: A

Question. Acetic anhydride is obtained by the reaction of
(a) P₂O₅ and acetic acid
(b) ethanol and acetic acid
(c) ammonia and acetic acid
(d) sodium and acetic acid

Answer: A

Question.  Benzoic acid may be converted to ethyl benzoate by reaction with
(a) dry HCl—C₂H₅OH
(b) sodium ethoxide
(c) ethyl chloride
(d) ethanol

Answer: A

Question. The product obtained when acetic acid is treated with phosphorus trichloride is
CH₃COCl
(a) CH₃COCl
(b) CH₃COOPCl₃
(c) ClCH₂COCl
(d) None of these 

Answer: A

Question. Benzoic acid reacts with conc. HNO₃ and H₂SO₄ to give :
(a) 3-Nitrobenzoic acid
(b) 4-Benzene sulphonic acid
(c) 4-Nitrobenzoic acid
(d) 2-Nitrobenzoic acid

Answer: A

Question. A carboxylic acid can best be converted into acid chloride by using
(a) ClCOCOCl
(b) SOCl₂
(c) PCl₅
(d) HCl

Answer: A

Question. The strongest acid among the following is –
(a) Salicylic acid
(b) m-hydroxybenzoic acid
(c) p-hydroxybenzoic acid
(d) Benzoic acid

Answer: A

Question. Among the following, the most acidic is
(a) Cl₂CHCOOH
(b) CH₃COOH
(c) ClCH₂COOH
(d) None of these

Answer: A