When ethyl alcohol and $KI$ react in the presence of $Na_2CO_3$,yellow crystals of which of the following are formed?

Glycerol reacts with $P_4 + I_2$ to form

The product $(B)$ of the reaction sequence is:
$Cl-C_6H_4-CH_2Br$ $\xrightarrow{Mg, Et_2O} A$ $\xrightarrow[2. H_3O^+]{1. CH_3CHO} B$

Reaction of Grignard reagent,$C_{2}H_{5}MgBr$ with $C_{8}H_{8}O$ followed by hydrolysis gives compound $A$ which reacts instantly with Lucas reagent to give compound $B$,$C_{10}H_{13}Cl$. The compound $B$ is

Absolute alcohol ($100\%$ alcohol) is obtained by the distillation of rectified spirit over which of the following?

Which of the following alcohols undergo a dehydration reaction with $Cu$ (copper) metal at $573 \ K$ temperature?