Product $(Y)$ of the above reaction is

$n$-Butylbenzene on oxidation with hot alkaline $KMnO_4$ gives

The reaction sequence is as follows:
$1,4-dibromocyclohex-2-ene$ $\xrightarrow[{2 \, molar \, equivalent}]{{(CH_3)_2NH}} (A)$ $\xrightarrow{{BaO}} (B)$ $\xrightarrow[{ (2 \, molar \, equivalent) }]{{CH_3I}} (C)$ $\xrightarrow{{Ag_2O \, / \, H_2O}} (D) + 2(CH_3)_3N$
Identify the end product $(D)$ in the given sequence.

The non-aromatic compound among the following is

Arrange the following compounds in their correct order of reactivity towards electrophilic substitution reaction:

In benzene,the $C-C-C$ and $C-C-H$ bond angles are.........