Product $A$ is

The reaction of the compound shown in the image with $alc. KOH$ yields:

How many isomers are possible for the compound with the molecular formula $C_2BrClFI$?

Consider the following sequence of reactions:
Nitrobenzene $\xrightarrow[(ii) NaNO_2, HCl, 0^{\circ}C]{(i) Sn + HCl} \text{Benzenediazonium chloride}$ $\xrightarrow{(iii) Cu_2Cl_2} \text{Chlorobenzene}$ $\xrightarrow{(iv) Na, \text{Ether}} A$
Molar mass of the product formed $(A)$ is $.............. \ g \ mol^{-1}$.

Identify the correct set of reagents or reaction conditions '$X$' and '$Y$' in the following set of transformation.

Match List-$I$ with List-$II$:

List-$I$ (Reaction)	List-$II$ (Name of reaction)
$A$. $2C_6H_5X + 2Na \xrightarrow{\text{Dry Ether}} C_6H_5-C_6H_5 + 2NaX$	$I$. Lucas reaction
$B$. $ArN_2^{+} X^{-} \xrightarrow[HCl]{Cu} ArCl + N_2 \uparrow + CuX$	$II$. Finkelstein reaction
$C$. $C_2H_5Br + NaI \xrightarrow{\text{Acetone}} C_2H_5I + NaBr$	$III$. Fittig reaction
$D$. $(CH_3)_3COH \xrightarrow[ZnCl_2]{HCl} (CH_3)_3CCl + H_2O$	$IV$. Gatterman reaction

Choose the correct answer from the options given below: