$2CHCl_3 + O_2 \xrightarrow{X} 2COCl_2 + 2HCl$. In the above reaction,$X$ stands for:

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?

In $S_{N}2$ reactions,the correct order of reactivity for the following compounds:

The following reaction,$(CH_3)_3CBr + H_2O \to (CH_3)_3COH + HBr$,is an example of:

The reaction of an alkyl halide with $Mg$ in dry ether produces ..... as the product.

Chloropicrin is obtained by the reaction of