Exercise 1

Marsh gas mainly contains.

Which of the following compounds, reacts slower than benzene in an electrophilic bromination?

The decreasing order of reactivity towards electrophilic substitution reaction of the following compounds is:

(i) benzene. (ii) chlorobenzene, (iii) nitrobenzene, (iv) toluene

The direct iodination of benzene is not possible because

Benzene reacts with $\mathrm{n}$ -propyl chloride in the presence of anhydrous ${\mathrm{AlCl}}_3$ to give predominantly:

The nitration of benzene with a mixture of concentrated ${\mathrm{HNO}}_3$ and concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ at $333 \mathrm{K}\left(60°\mathrm{C}\right)$ gives____. 

${\mathrm{C}}_6{\mathrm{H}}_6\underset{\mathrm{concentrated} {\mathrm{H}}_2{\mathrm{SO}}_4,363\mathrm{K}}{\overset{\mathrm{concentrated} {\mathrm{HNO}}_3\left(\mathrm{excess}\right)}{\to }}\mathrm{X}\stackrel{{\left({\mathrm{NH}}_4\right)}_2 \mathrm{S}}{⟶}\mathrm{Y}$

In the above reaction sequence, $\mathrm{X}$ and $\mathrm{Y}$ are, respectively,

Which of the following reaction is an elimination reaction?