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

Which product is obtained by the oxidation of ethylbenzene with $KMnO_4$?

$A$ compound $X$ formed after heating coke with lime reacts with water to give $Y$,which on passing over red hot iron at $873 \ K$ produces $Z$. The compound $Z$ is:

Identify the number of aromatic compounds from the following structures:
$(i)$ $1,2,4$-triazole
(ii) $2$-pyrone
(iii) Benzimidazole
(iv) Pyrazole
$(v)$ Cyclooctatetraene dianion
(vi) Pyrrolidinium cation
(vii) Cyclopentadienyl cation

Which of the following is non-aromatic?

$C_6H_6$ $\xrightarrow{HNO_3, H_2SO_4} X$ $\xrightarrow{Cl_2, FeCl_3} Y$. In the above sequence,$Y$ is: