The major product of the following reaction is

What will be the major product of following sequence of reactions?

Consider the following reaction,

$\mathrm{A}\underset{\begin{array}{l}2. {\mathrm{CN}}^{-}\\ 3. {\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}/∆\end{array}}{\overset{1. {\mathrm{Cl}}_2/\mathrm{hv}}{\to }}4-\mathrm{bromophenylacetic} \mathrm{acid}$

What is $\mathrm{A}$ in the above reaction?

In the given conversion the compound $\mathrm{A}$ is

Most stable product of the following reaction is

In the above reaction product $\mathrm{B}$ is

Considering the above reactions, the compound '$\mathrm{A}$' and compound '$\mathrm{B}$' respectively are