The number of \(\sigma\)-bonds, \(\pi\)-bonds and lone pairs of electrons present in the product C respectively are
\[
C_2H_5NO_2
\xrightarrow{Sn/HCl}
A
\xrightarrow[\text{Heat}]{CHCl_3+KOH}
B
\xrightarrow{H_2O}
C
\]
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Carbylamine reaction forms isocyanides from primary amines. Hydrolysis of isocyanides gives formamides.