Which one of the following compounds gives carboxylic acid with $HNO_2$?
- A$C_6H_5COCl$
- B$C_6H_5CONH_2$
- C$(CH_3CO)_2O$
- D$CH_3COOC_2H_5$
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$C_6H_5N_2^+Cl^-$ $\xrightarrow{CuCN/KCN} P$ $\xrightarrow{LiAlH_4} Q$ $\xrightarrow{HNO_2} X$
$C_6H_5N_2^+Cl^-$ $\xrightarrow{CuCN/KCN} P$ $\xrightarrow{LiAlH_4} Q$ $\xrightarrow{HNO_2} X$
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$(2) \ CH_3CH_2NH_2$
$(3) \ PhCH_2CONH_2$
$(1) \ CH_3CONH_2$
$(2) \ CH_3CH_2NH_2$
$(3) \ PhCH_2CONH_2$
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