Match the following reactions in Column-II with the names in Column-I.
\[
\begin{array}{llll}
(a) & \text{Cannizzaro reaction} & (p) & ArN_2^+Cl^- \xrightarrow{Cu/HBr} ArBr \\[10pt]
(b) & \text{Carbylamine reaction} & (q) &
C_6H_5CHO \xrightarrow{\text{Conc. NaOH}}
C_6H_5CH_2OH + C_6H_5COONa \\[10pt]
(c) & \text{Gattermann reaction} & (r) &
ArN_2^+Cl^- \xrightarrow{CuCN/KCN} ArCN \\[10pt]
(d) & \text{Sandmeyer reaction} & (s) &
C_6H_5NH_2 \xrightarrow[alc.\,KOH]{CHCl_3,\ \Delta} C_6H_5NC
\end{array}
\]