(A) Explain the following reactions and write chemical equation involved: (a) Wolff-Kishner reduction (b) Etard reaction (c) Cannizzaro reaction

Explain the following reactions and write chemical equation involved :

Wolff-Kishner reduction

Etard reaction

Cannizzaro reaction

Write the structures of A, B and C in the following sequence of reactions : $\displaystyle \mathbf{2} \times \mathbf{1} \frac{\mathbf{1}}{\mathbf{2}}=\mathbf{3}$

$\displaystyle \mathrm{CH}_{3} \mathrm{COOH} \xrightarrow{\mathrm{SOCl}_{2}} \mathrm{~A} \xrightarrow{\mathrm{H}_{2}, \mathrm{Pd}-\mathrm{BaSO}_{4}} \mathrm{~B} \xrightarrow{\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}} \mathrm{C}$

$\displaystyle \mathrm{CH}_{3} \mathrm{CN} \xrightarrow[\text { 2. } \mathrm{H}_{2} \mathrm{O}]{\text { 1.(DIBAL-H) }} \mathrm{A} \xrightarrow{\text { Dil. } \mathrm{NaOH}} \mathrm{B} \xrightarrow{\Delta} \mathrm{C}$