The hybridisation states of carbon atom bonded to halogen atom in haloalkanes and haloarenes are ${\mathrm{sp}}^3$ and ${\mathrm{sp}}^2$ respectively.

The CORRECT match of compound in Column $\mathrm{A}$ with density in Column $\mathrm{B}$ is

Classify the following compounds into haloalkanes and haloarenes.

${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}, {\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}, {\mathrm{CH}}_3\mathrm{Br}, {\mathrm{CHCl}}_3, {\mathrm{C}}_6{\mathrm{H}}_4{\mathrm{Br}}_2$

$\left(\mathrm{B}\right)$ in the above reaction is

The correct order of rate of ${\mathrm{S}}_{\mathrm{N}}1$ reaction is: