Which one of the following compounds gives carboxylic acid with HNO2?
A
C6H5−O||C−Cl
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B
C6H5CONH2
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C
CH3−O||C−O−O||C−CH3
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D
CH3COOC2H5
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Solution
The correct option is CC6H5CONH2 Benzamide C6H5CONH2 forms carboxylic acid (benzoic acid) with nitrous acid HNO2. In this reaction, −NH2 group is replaced with −OH group. NaNO2+HCl(dil)→HNO2 C6H5CONH2+HNO2→C6H5COOH+N2+H2O