Which among the following statements is $TRUE$ about gammexane?

Which of the following statement$(s)$ is/are true about alkyl halides?

Given below are two statements:
Statement $(I)$: Benzyl chloride reacts faster in $S_N1$ mechanism than ethyl chloride.
Statement $(II)$: Ethyl carbocation intermediate is less stabilized by hyperconjugation than benzyl carbocation by resonance.
In the light of the above statements, choose the correct answer from the options given below:

The major product $(A)$ of the following reaction is:

The ${S_{N}2}$ reaction of an asymmetric carbon compound always gives:

Write the mechanism of the following reaction:
$n-BuBr + KCN \xrightarrow{EtOH/H_2O} n-BuCN$