Polysubstitution is a major drawback in

The increasing order of reduction of alkyl halides with zinc and dil. $HCl$ is:

Which of the following represents the Wurtz-Fittig reaction?

The insecticide containing $99\%$ $\gamma-isomer$ of benzene hexachloride is known as

Given below are two statements $:$
Statement $(I) :$ Alcohols are formed when alkyl chlorides are treated with aqueous potassium hydroxide by elimination reaction.
Statement $(II) :$ In alcoholic potassium hydroxide,alkyl chlorides form alkenes by abstracting the hydrogen from the $\beta-$carbon.
In the light of the above statements,choose the most appropriate answer from the options given below $:$

An alkyl bromide $(A)$ forms a Grignard reagent which on treatment with water yields $n$-hexane. When $(A)$ is treated with sodium in dry ether,$4,5$-diethyloctane is formed. The structure of $(A)$ is: