The reaction of toluene with ${\mathrm{Cl}}_2$ in presence of ${\mathrm{FeCl}}_3$ gives $\text{'}\mathrm{X}\text{'}$ and reaction in presence of light gives$\text{'}\mathrm{Y}\text{'}$. Thus,$\text{'}\mathrm{X}\text{'}$ and$\text{'}\mathrm{Y}\text{'}$ are:

The correct order of increasing reactivity of $\mathrm{C}-\mathrm{X}$ bond towards nucleophile substitution in the following compounds is:

Identify $\mathrm{Z}$ in the sequence of reactions:
${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2\underset{{\mathrm{H}}_2{\mathrm{O}}_2}{\overset{\mathrm{HBr}}{\to }}\mathrm{Y}\stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}}{\to }\mathrm{Z}$

Consider the reaction,

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}+\mathrm{NaCN}\to {\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CN}+\mathrm{NaBr}$

This reaction will be the fastest in:

What will be the Product?