BITSAT Chemistry Aldehycles Ketones and Carboxylic Acids MCQs

is known as

a) Wurtz reaction

b) Koch reaction

c) Clemmensen reduction

d) Kolbe’s reaction

Answer: Koch reaction

Question: The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is :

a) B > A > D > C

b) B > D > C > A

c) A > B > C > D

d) A > C > B > D

Answer: B > A > D > C

Question: When 2-hydroxybenzoic acid is distilled with zinc dust, it gives

a) Phenol

b) Benzoic acid

c) Benzaldehyde

d) A polymeric compound

Answer: Benzoic acid

Question: Nucleophilic addition reaction will be most favoured in

a) (CH₃)₂C = O

b) CH₃CH₂CHO

c) CH₃CHO

d)                                             

Answer: CH₃CHO

Question: CCl₃CHO (Chloral) does not give aldol condensation because

a) Of three highly electronegative Cl atoms.

b) Of steric hinderance caused by Cl atoms

c) It does not have a-H atom

d) All of these

Answer: It does not have a-H atom

Question: The preparation of ethyl acetoacetate involves

a) Wittig reaction

b) Cannizzaro’s reaction

c) Reformatsky reaction

d) Claisen condensation

Answer: Claisen condensation

Question: Which one of the following pairs is not correctly matched?

a) > C = O → > CH₂ (Clemmensen reduction)

b) > C = O → > CHOH (Wolf – Kishner reduction)

c) COCl → – CHO (Rosenmund reduction)

d) – C º N → – CHO (Stephen reduction)

Answer: > C = O → > CHOH(Wolf – Kishner reduction)

Question: Which of the following esters cannot undergo Claisen self condensation ?

a) CH₃CH₂CH₂CH₂COOC₂H₅

b) C₆H₅–COOC₂H₅

c) C₆H₁₁CH₂COOC₂H₅

d) C₆H₅CH₂COOC₂H₅

Answer: C₆H₅–COOC₂H₅

Question: Schotten-Baumann reaction is a reaction of phenols with

a) Benzoyl chloride and sodium hydroxide

b) Acetyl chloride and sodium hydroxide

c) Salicylic acid and conc. H₂SO₄

d) Acetyl chloride and conc H₂SO₄

Answer: Benzoyl chloride and sodium hydroxide

Question: Identify X,

a) CH₃OH

b) Ethyl alcohol

c) Methyl cyanide

d) Tert-Butyl alcohol

Answer: Tert-Butyl alcohol

Question: The reagent (s) which can be used to distinguish acetophenone from benzophenone is (are)

a) 2,4- Dinitrophenylhydrazine

b) Aqueous solution of NaHSO₃

c) Benedict reagent

d) I₂and NaOH

Answer: I₂and NaOH

Question: Formic acid and acetic acid can be distinguished by

a) Phenyl hydrazine

b) NaHCO₃

c) Tollen’s reagent

d) None of these

Answer: Tollen’s reagent

Question: When esters are hydrolysed the product gives hydrogen ions. The product which gives hydrogen ion is :

a) Acid

b) Alcohol

c) Both

d) Either acid or alcohol

Answer: Acid

Question: Which of the following compound can not used in preparation of iodoform?

a) CH₃CHO

b) CH₃COCH₃

c) HCHO

d) 2- propanol

Answer: HCHO

Question: When sodium propionate is heated with sodalime which product is formed :

a) Propyl amine

b) Ethane

c) Acetone

d) Acetaldehyde

Answer: Ethane

Question: When Acetic Acid is heated with P₂O₅ the compound formed will be :

a) (CH₃CO)₂O

b) CH₃COCH₃

c) CH₃CHO

d) CH₄

Answer: (CH₃CO)₂O

Question: In which reaction, an aromatic aldehyde is treated with acetic anhydride in presence of corresponding salt of the acid to give an unsaturated aromatic acid ?

a) Friedel-Crafts reaction

b) Perkin’s reaction

c) Wurtz reaction

d) None of these

Answer: Perkin’s reaction

Question: In the reduction

the catalyst used is :

a) Ni

b) Pd

c) Pt

d) Any of these

Answer: Any of these

Question: The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is :

a) A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol

b) A carbonyl compound with a hydrgen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

c) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation

d) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.

Answer: A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.

Question: If acetylchloride is reduced in the presence of BaSO₄ and Pd, then

a) CH₃CHO is formed

b) CH₃COOH is formed

c) CH₃CH₂OH is formed

d) CH₃COCH₃ is formed

Answer: CH₃CHO is formed

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: 3-Nitrobenzoic acid

Question: Oxidation of acetaldehyde with selenium dioxide produces

a) Ethanoic acid

b) Methanoic acid

c) Glyoxal

d) Oxalic acid

Answer: Glyoxal

Question: An organic compound 'X' having molecular formula C₅H₁₀O yields phenyl hydrazone and gives negative response to the Iodoform test and Tollen's test. It produces n-pentane on reduction. 'X' could be :-

a) 2-pentanone

b) 3-pentanone

c) n-amyl alcohol

d) Pentanal

Answer: 3-pentanone

Question: Treatment of cyclopentanone 

 with methyl lithium gives which of the following species?

a) Cyclopentanonyl cation

b) Cyclopentanonyl radical

c) Cyclopentanonyl biradical

d) Cyclopentanonyl anion

Answer: Cyclopentanonyl anion

Question: When sodium propionate is heated with sodalime which product is formed :

a) Propyl amine

b) Ethane

c) Acetone

d) Acetaldehyde

Answer: Ethane