CBSE Class 12 Chemistry Notes: Carboxylic Acids – Objective Questions

Prob 1.    End products of the following sequence of reactions is

A.

B.

C.

D.

Sol.Intermediate is

 which loses CO₂ on heating.

∴     (C)

Prob 2.    End product of the reaction    is

A.

B.

C.

D.

Sol.         NaBH₄ reduces ketonic group but not acidic group

 is the intermediate which forms cyclic ester.

Prob 3.    R – CH₂ – CH₂OH can be converted into R- CH₂CH₂COOH. The correct sequence of reagents is

(A)                          (B) 

(C)                                         (D) 

Sol.        

∴      (A)

Prob 4.    The ease of alkaline hydrolysis is more for

A.

B  

C.

D.

Sol.         There is more electron deficiency on carbonyl carbon in

∴     (A)

Prob 5.    Which of the following undergoes HVZ reaction?

(A) HCOOH                                                    (B)  CCl₃COOH

(C) C₆H₅COOH                                                (D)  none

Sol.         None of these contains a – hydrogen.

∴        (D) 

Prob 6.    The product C in the reaction

(A)  CH₃CH = CHCHO                                     (B)  CH₃CH = CHCOOH

(C)  CH₃CH₂CHO                                             (D)  CH₃CH_­2CH₂COOH

Sol.        

Prob 7.    The end product of the reaction is

C is

(A)     propanoic acid                                      (B)  adipic acid

(C)     malonic acid                                         (D)  succinic acid

Sol.

Prob 8.    Find out D in the following sequence

A.

B. 218

C.

D.

Sol.

Prob 9.    The order of the acidic strength of following acids is

               (i) CH₃CH₂COOH           (ii) CH₂ = CHCOOH            (iii) CH º CCOOH

               (A)     i > ii > iii                                                (B)  iii > ii > i

               (C)     ii > i > iii                                                (D)  iii > i > ii

Sol.      sp hybridized carbon is most electronegative and it stabilizes the carboxylate ion. to the maximum extent

Prob 10.

A and B are 

(A) CH₃COCH₂COOH, CH₃COCH₃                    (B)  CH₃CH(OH)CH₃, CH_­3COCH₃

(C) CH₃COCH₃, CH₃COOH                               (D)  CH₃CH = CHCOOH, CH₃CH = CH₂

Sol.

Prob 11. 

B is

(A)                                    (B) 

(C)                                 (D) 

Sol.        

∴ (A)

Prob 12

 A is

A.

B.

C.

D.

Sol.

Prob 13.  The carboxylic acid which has maximum solubility in water is

               (A) phthalic acid                                              (B)  succinic acid

               (C) malonic acid                                              (D)  salicylic acid

Sol.         Salicylic acid has intramolecular hydrogen bonding. So it is least soluble. Out of the first three acids malonic acid has smallest non – polar alkyl part. So it is most soluble.

∴ (C)

Prob. 14

A.

B.

C.

D. None of these

Sol.

Prob.

In the reaction

               Identify C.

               (A)     CH₃CH₂CN                                             (B)  CH₃CH₂CH₂NH₂

               (C)     CH₃CH₂CH₂OH                                       (D)  (CH₃CH₂CO)₂O 

Sol.

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