Which of the following is not a nitro-derivative?

The total number of electrons in the amide group $-CONH_2$ is:

Given below are two statements:
Statement $I$ : Aminobenzene and aniline are same organic compounds.
Statement $II$ : Aminobenzene and aniline are different organic compounds.
In the light of the above statements,choose the most appropriate answer from the options given below:

The Bhopal gas tragedy of $1984$ was caused by

The number of structural isomers possible from the molecular formula $C_3H_9N$ is

$A$ secondary amine is: