Identify the name of the compound from the following structure.

Which one of the following is the molecular formula of a tertiary amine?

Nitrobenzene is prepared from benzene using a mixture of concentrated $HNO_3$ and concentrated $H_2SO_4$. In the nitrating mixture,$HNO_3$ acts as a ........

The Bhopal gas tragedy of $1984$ was caused by

An aqueous solution of sodium nitrite on boiling with $\alpha$-chlorosodium propionate gives:

The structure of the functional group of a secondary amide is: