By passing excess $Cl_{2(g)}$ in boiling toluene, which one of the following compounds is exclusively formed?

In which reaction is a racemic mixture not obtained?

Bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ lost their original labels. They were labelled $A$ and $B$ for testing. $A$ and $B$ were separately taken in test tubes and boiled with $NaOH$ solution. The end solution in each tube was made acidic with dilute $HNO_3$ and then some $AgNO_3$ solution was added. Substance $B$ gave a yellow precipitate. Which one of the following statements is true for this experiment?

Which compound might be synthesized by the $S_N2$ displacement of an alkyl-halide?

Ethylene difluoride on hydrolysis gives

$DDT$ is prepared by reacting chlorobenzene with