In the questions arrange the compounds in increasing order of rate of reaction towards nucleophilic substitution.

Alkyl fluorides are synthesised by heating an alkyl chloride/bromide in presence of _____ or _____.

Which of the compounds will react faster in ${\mathrm{S}}_{\mathrm{N}}1$ reaction with the ${}^{-}\mathrm{OH}$ ion?

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$ or ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\mathrm{Cl}$