Assignment

The correct orders of reactivity towards ${\mathrm{S}}_{\mathrm{N}}1$ reaction is

${\mathrm{CH}}_3-\mathrm{Cl}+\mathrm{Nal}\stackrel{\text{ Acetone }}{\rightleftharpoons }{\mathrm{CH}}_3-\mathrm{I}+\mathrm{NaCl}$
Above equilibrium is more towards right because

$\mathrm{NBS}$ is a specific reagent for

Hunsdiecker reaction is used to prepare alkyl chloride and alkyl bromide starting from

The product $\left(\mathrm{C}\right)$ is

In the given reaction

The product will be

Under identical conditions, solvolysis of which of the following substrate would lead to maximum racemisation?

When cis-but-$2$-ene is treated with ${\mathrm{Br}}_2$ in ${\mathrm{CCl}}_4$ medium the product formed will be