The reactivity order of the following molecules towards $S_N1$ reaction is:
$(I)$ Allyl chloride
$(II)$ Chlorobenzene
$(III)$ Ethyl chloride

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ $R-I$ undergoes $S_N2$ reaction faster than $R-Cl$.
Reason $(R):$ Iodine is a better leaving group because of its large size.
In the light of the above statements,choose the correct answer from the options given below:

The product formed on the reaction of ethyl alcohol with bleaching powder is:

Arrange the following in order of ease of dehydrohalogenation:
$(i)$ Bromocyclohexane
(ii) $3-$Bromocyclohexene
(iii) $3-$Bromocyclohexa$-1,4-$diene
(iv) Bromobenzene

Which alkyl halide has the highest bond enthalpy of the $C-X$ bond?

The relative reactivity of
$(I)$ Benzyl chloride
$(II)$ $p$-methoxy benzyl chloride
$(III)$ $p$-Nitrobenzyl chloride
Towards $S_N^1$ reaction follows the order