Compound $(A)$ is

The major product $'A'$ of the following given reaction has $......\,sp^2$ hybridized carbon atoms.
$2,7-\text{Dimethyl}-2,6-\text{octadiene} \xrightarrow{H^{+}} A \text{ (Major Product)}$

The dibromo compound $[P]$ (molecular formula : $C_{9}H_{10}Br_{2}$) when heated with excess sodamide followed by treatment with dilute $HCl$ gives $[Q]$. On warming $[Q]$ with mercuric sulphate and dilute sulphuric acid yields $[R]$ which gives positive Iodoform test but negative Tollen's test. The compound $[P]$ is:

Choose the correct option$(s)$ that give$(s)$ an aromatic compound as the major product.

Consider the following reaction in which the intermediate carbocation loses $H^{+}$ to give the final product:
Which of the following energy profiles best represents the overall reaction?

The unknown $(P)$ of the reaction is