In the presence of sunlight,benzene reacts with $Cl_{2}$ to give product $X$. The number of hydrogens in $X$ is $.....$

Treatment of benzene with $CO / HCl$ in the presence of anhydrous $AlCl_3 / CuCl$ followed by reaction with $Ac_2O / NaOAc$ gives compound $X$ as the major product. Compound $X$ upon reaction with $Br_2 / Na_2CO_3$,followed by heating at $473 \ K$ with moist $KOH$ furnishes $Y$ as the major product. Reaction of $X$ with $H_2 / Pd-C$,followed by $H_3PO_4$ treatment gives $Z$ as the major product.
$(1)$ The compound $Y$ is
$(2)$ The compound $Z$ is
Identify the correct options for $(1)$ and $(2)$ respectively.

$x =$ Number of aromatic compounds obtained when the above compound undergoes complete acidic hydrolysis.

The number of possible aromatic benzenoid isomers for $C_6H_4Cl_2$ are

At room temperature,styrene is in the ....... state.

The species responsible for nitration and sulphonation by nitric acid/conc. $H_2SO_4$ and fuming $H_2SO_4$ are :