The reaction of $n$-propyl bromide with alcoholic potassium hydroxide $(KOH)$ produces ...........

Benzene $+ (CH_3CO)_2O$ $\xrightarrow{AlCl_3} X$ $\xrightarrow{Zn-Hg, HCl} Y$ $\xrightarrow{NBS} Z$;
$Z$ is

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 $:$

Bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ lost their original labels. They were labelled $A$ and $B$ for testing. $A$ and $B$ were separately taken in test tubes and boiled with $NaOH$ solution. The end solution in each tube was made acidic with dilute $HNO_3$ and then some $AgNO_3$ solution was added. Substance $B$ gave a yellow precipitate. Which one of the following statements is true for this experiment?

Which of the following Grignard reagents can be prepared?

The order of the rate of $S_N1$ reactivity for the following compounds is: