Which one of the following compounds gives carboxylic acid with $H N O_{2}$ ?

C_{6} H_{5} - O | | C - C l

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C_{6} H_{5} C O N H_{2}

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C H_{3} - O | | C - O - O | | C - C H_{3}

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C H_{3} C O O C_{2} H_{5}

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Solution

The correct option is C $C_{6} H_{5} C O N H_{2}$
Benzamide $C_{6} H_{5} C O N H_{2}$ forms carboxylic acid (benzoic acid) with nitrous acid $H N O_{2}$ . In this reaction, $- N H_{2}$ group is replaced with $- O H$ group.
$N a N O_{2} + H C l (d i l) \to H N O_{2}$
$C_{6} H_{5} C O N H_{2} + H N O_{2} \to C_{6} H_{5} C O O H + N_{2} + H_{2} O$

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