In the above reaction,' $X$ ' is:

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : Benzene is more stable than hypothetical cyclohexatriene.
Reason $R$ : The delocalized $\pi$ electron cloud is attracted more strongly by nuclei of carbon atoms.
In the light of the above statements,choose the correct answer from the options given below:

The ease of nitration of the following three hydrocarbons follows the order: $(I)$ Toluene,$(II)$ $m$-Xylene,$(III)$ $p$-Xylene.

What will be the product $A$ in the reaction given below?

Identify the major product of the following reaction:

The major product $P$ formed in the following reaction is: