In benzene,the total number of $\sigma$ bonds is

The radical,$C_6H_5CH_2^{\bullet}$,is aromatic because it has

Which among the following is a non-benzenoid aromatic compound?

In the process of formation of nitronium ion,nitric acid acts as

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 product of the following reaction is: