The stable carbocation formed in the above reaction is :

A compound '$\mathrm{A}$' on reaction with '$\mathrm{X}$' and '$\mathrm{Y}$ produces the same major product but different by product '$\mathrm{a}$' and '$\mathrm{b}$'. Oxidation of '$\mathrm{a}$' gives a substance produced by ants.

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'$\mathrm{X}$' and '$\mathrm{Y}$' respectively are

Major product of the following reaction is

The major product formed in the given reaction is:

Given below are two statements. One is labelled as Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$.

Assertion $\mathrm{A}:\left[6\right]$ Annulene. $\left[8\right]$ Annulene and cis $-\left[10\right]$ Annulene, are respectively aromatic, not-aromatic and aromatic.

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Reason $\mathrm{R}$: Planarity is one of the requirements of aromatic systems.

In the light of the above statements, choose the most appropriate answer from the options given below.

Major product '$\mathrm{B}$' of the following reaction sequence is