Product (C) obtained in the following sequence of reaction is

Consider the following reactions

a. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}\stackrel{\mathrm{Cu}(573 \mathrm{K})}{⟶}\mathrm{A}$

b. ${\mathrm{CH}}_3-\mathrm{CH}\left(\mathrm{OH}\right)-{\mathrm{C}}_2{\mathrm{H}}_5\stackrel{\mathrm{Cu}(573 \mathrm{K})}{⟶}\mathrm{B}$

Products $\mathrm{A}$ and $\mathrm{B}$ respectively are

Number of optically active products formed in following reaction is

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO}+\mathrm{HCN}\underset{(\mathrm{ii}) {\mathrm{H}}^{+}}{\overset{(\mathrm{i}) {\mathrm{OH}}^{-}}{\to }}$

Consider the following reactions.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}\underset{\left(\mathrm{ii}\right){\mathrm{H}}_2\mathrm{O}}{\overset{(\mathrm{i}) {\mathrm{Br}}_2/Red\mathrm{P}}{\to }}\mathrm{A}.$ major product $\mathrm{A}$ is

Consider the following reaction.

Major product $\mathrm{B}$ is

The reaction given below is called