Which of the following compounds has a $P-P$ bond?

Atoms in a $P_4$ molecule of white phosphorus are arranged regularly in space in which of the following way?

Phosphine may be produced by adding water to

$Assertion :$ Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
$Reason :$ The reaction between nitrogen and oxygen requires high temperature.

Which one of the following combines with $Fe(II)$ ions to form a brown complex?

On heating,compound $(A)$ gives a gas $(B)$ which is a constituent of air. This gas when treated with $3 \, \text{moles}$ of hydrogen $(H_2)$ in the presence of a catalyst gives another gas $(C)$ which is basic in nature. Gas $(C)$ on further oxidation in moist condition gives a compound $(D)$ which is a part of acid rain. Identify compounds $(A)$ to $(D)$ and also give necessary equations of all the steps involved.