Which of the following reactions is used for the conversion of alkyl chloride to alkyl iodide?

Identify reactant (A) used in the following conversion.

Chlorobenzene $$+\mathrm{A} \underset{\mathrm{AlCl}_3}{\stackrel{\text { anhydrous }}{\longrightarrow}} 1-$$ Chloroacetophenone $$+4 -$$ Chloroacetophenone

Identify '$$\mathrm{A}$$' in the following reaction.

$$A \stackrel{\text { Na/dry ether }}{\longrightarrow}$$ 3,4-diethyl-3,4-dimethylhexane $$+2 \mathrm{NaCl}$$

How many molecules of methyl iodide are required to obtain tetramethyl ammonium iodide from dimethyl amine?