Question

47. Which of the following is not a method for preparation of phenol
(A) Dows process
(B) From diazonium salt
(C) By decarboxylation of salicylic acid
(D) By the decarboxylation of sodium benzoate
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Answer 1

Answer:

(D) By the decarboxylation of sodium benzoate

Explanation:

Answer 2

Phenol cannot be prepared from the decarboxylation of sodium benzoate. Hence option(A) is correct.

• Dows process involves the treatment of chlorobenzene with molten sodium hydroxide to yield phenol.
• Benzene diazonium salts on hydrolysis, in an acidic medium, yield phenol with the evolution of nitrogen gas.
• Salicylic acid on decarboxylation, loses the carboxylic acid group at the ortho position to yield phenol.  
• Sodium benzoate on decarboxylation yields benzene, not phenol.