In the mixture of conc. $H_2SO_4$ and $HNO_3$,the nitrating species is:

Which of the following will show aromatic behaviour?

Benzene is treated with oleum to produce compound $(X)$,which when further heated with molten sodium hydroxide followed by acidification produces compound $(Y)$. The compound $(Y)$ is treated with zinc metal to produce compound $(Z)$. Identify the structure of compound $(Z)$ from the following options.

Assertion : Tropylium cation is aromatic in nature.
Reason : The only property that determines its aromatic behaviour is its planar structure.

Which of the following compounds will undergo electrophilic substitution more readily than benzene?

The number of chlorine atoms present in the organic products $X$ and $Y$ of the following reactions, respectively, are:
$\text{Benzene} + 6Cl_2 \xrightarrow[\text{dark, cold}]{\text{Anhydr. } AlCl_3} X$
$\text{Benzene} + 3Cl_2 \xrightarrow{UV, 500 \text{ K}} Y$