The product of the reaction will be:

Assertion $A:$ Hydrolysis of an alkyl chloride is a slow reaction but in the presence of $NaI$,the rate of the hydrolysis increases.
Reason $R:$ $I^{-}$ is a good nucleophile as well as a good leaving group.
In the light of the above statements,choose the correct answer from the options given below.

In the following reaction $C_{6}H_{5}CH_{2}Br \xrightarrow[(ii)H_{3}O^{+}]{(i)Mg, \text{Ether}} X$
Product $X$ is

The order of relative reactivity of the given halides towards $S_N1$ reaction is:

Which of the following compounds will undergo $E_2$ elimination reaction to give a single product in the presence of a strong base?

Predict the correct reactivity order of the following compounds towards $S_N1$ reaction: