$CH_3-CH_2-Cl \xrightarrow{alc. KOH} A$,the product is

The major product $(A)$ is:

Which of the following would not give $2-$phenylbutane as the major product in a Friedel-Crafts alkylation reaction?

From the given pairs of compounds,in which will the first compound undergo $S_N2$ reaction faster?

$A$ 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

Which one of the following compounds will give a $Saytzeff$ alkene as the major product in an elimination reaction?