Identify the compounds [A], [B] and [C] in the following reactions.

$\text{C}_6\text{H}_5\text{NO}_2 \xrightarrow[\text{Sn/HCl}]{6[\text{H}]} [\text{A}] \xrightarrow[273\text{K}-278\text{K}]{\text{HNO}_2 + \text{HCl}} [\text{B}] \xrightarrow{\text{C}_6\text{H}_5\text{NH}_2} [\text{C}]$

$\text{CH}_3\text{CH}_2\text{NH}_2 \xrightarrow[\text{(2) }\text{P/Cl}_2]{\text{(1) }\text{HNO}_2} [\text{A}] \xrightarrow[\text{(2) }\text{H}_2\text{O/H}^+]{\text{(1) }\text{KCN}} [\text{B}] \xrightarrow[\text{(2) }\text{Br}_2\text{/KOH}]{\text{(1) }\text{NH}_3/\text{heat}} [\text{C}]$