$C_7H_8$ $\xrightarrow{3Cl_2 / \text{heat}} A$ $\xrightarrow{Fe/Br_2} B$ $\xrightarrow{Zn/HCl} C$. What is compound $C$?

Which among the following compounds reacts with $NaOH$ at the fastest rate?

Presence of a nitro group in a benzene ring

Arrange the following compounds in decreasing order of their reactivity towards electrophilic substitution $(S_E)$ reaction: $I$. Chlorobenzene,$II$. Benzene,$III$. Anilinium chloride,$IV$. Toluene.

The reaction of compound $P$ with $CH_3MgBr$ (excess) in $(C_2H_5)_2O$ followed by addition of $H_2O$ gives $Q$. The compound $Q$ on treatment with $H_2SO_4$ at $0^{\circ}C$ gives $R$. The reaction of $R$ with $CH_3COCl$ in the presence of anhydrous $AlCl_3$ in $CH_2Cl_2$ followed by treatment with $H_2O$ produces compound $S$ [$Et$ in compound $P$ is ethyl group].
$(1)$ The product $S$ is
$(2)$ The reactions,$Q$ to $R$ and $R$ to $S$,are

$A$. Dehydration and Friedel-Crafts acylation	$B$. Aromatic sulfonation and Friedel-Crafts acylation
$C$. Friedel-Crafts alkylation,dehydration and Friedel-Crafts acylation	$D$. Friedel-Crafts alkylation and Friedel-Crafts acylation

Given the answer question $(1)$ and $(2)$

Which of the following undergoes hydrolysis most easily?