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Question

An organic compund A on treatment with NH3 gives B which on heating gives C, C when treated with Br2 in the presence of KOH produces ethylamine. Compound A is :

A
CH3 CH2 COOH
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B
CH3COOH
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C
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D
CH3 CH2 CH2 COOH
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Solution

The correct option is A CH3 CH2 COOH
Br2/KOH is the reagent for Hoffmann bromamide reaction. In this reaction amide is coverted primary amine.
Thus, 'C' is an amide.
Carboxylic salt on heeating gives amide.
Thus, 'A' is a carboxylic acid which on reaction with NH3 forms salt.
Product of hoffmann bromamide reaction is ethamine. Thus, 'A' is ethanoic acid.

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