$A$ mixture of an alkyl halide and an aryl halide is treated with sodium in dry ether. What is the name of this reaction?

$CH_3-CH_2-CH_2-Cl$ $\xrightarrow{KOH_{(aq)}} X$ $\xrightarrow{H^{+}/\Delta} Y$ $\xrightarrow{Cl_2/H_2O} Z$ (Major); $Z$ is

$A$ bromoalkane $X$ reacts with magnesium in dry ether to form compound $Y$. The reaction of $Y$ with methanal followed by hydrolysis yields an alcohol having molecular formula $C_{4}H_{10}O$. The compound $X$ is

Select the incorrect option:

Which compound might be synthesized by the $S_N2$ displacement of an alkyl-halide?

The conversion of ethyl bromide to ethyl iodide using sodium iodide and dry acetone is known as: