Which of the following reactions can be used to convert an alkyl halide into an alcohol?

The one giving the maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement):

In the reaction of $2$-chlorobutane with aqueous $KOH$,the product $A$ formed is:

When alcoholic $KOH$ is reacted with $CH_3CH_2Cl$ to form an alkene,which species acts as the attacking reagent?

An organic compound $X$ $(C_7H_7Cl)$ when reacted with $KCN$ in $C_2H_5OH$ gives a major product $Y$. $Z$ is formed when $Y$ is reduced with $LiAlH_4$. What are $Y$ and $Z$?

The major product obtained when this substrate is subjected to $E_2$ reaction under the treatment of potassium $tert$-butoxide is: