9. Hydricarbon — Chemistry STD 11 Science — Question

$B.$ Benzene reacts with concentrated nitric acid at $323-333\, k$ in the presence of concentrated sulphuric acid to form nitrobenzene. This reaction is known as nitration of benzene

$C.$ Benzene is nonpolar and water is highly polar. If we add benzene to water, benzene will float on the top of the water with no apparent mixing.

$D.$ The alkylation reaction of benzene with methanol to produce toluene: $Y - C$ and $Y - C _{ cs }$ catalyst. The secondary reaction of toluene is difficult to be suppressed in benzene alkylation with methanol over conventional acidic zeolite catalysts. Moreover, the formation of coke yet remains a challenging problem.

Therefore on seen the all above option, we find $NO _3$ is best Suitable option.