The following is a substitution reaction in which $-CN$ replaces $-Cl$:
$R-Cl \xrightarrow[\text{alcoholic}]{KCN, \Delta} R-CN + KCl$
To obtain propanenitrile,$R-Cl$ should be:

Which of the following pairs of compounds on heating gives butanenitrile?

What are reactant $X$ and product $Y$ in the following sequence of reactions?
Reactant $X$ $\xrightarrow{\text{Pyridine, } CH_3C_6H_4SO_2Cl}$ Intermediate $\xrightarrow{NaN_3, \text{Ethanol-water}}$ Product $Y$

$A$ solution of $(\pm)-2$-chloro-$2$-phenylethane in toluene is mixed slowly with a small amount of $SbCl_5$. The reaction proceeds due to the formation of:

For the given reaction,what is the major product '$A$'?
$3-\text{ethylbenzonitrile} + Br_2 \xrightarrow{UV \text{ light}} A$

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: