Which of the following allotropes of phosphorus is the most stable?

The structure of white phosphorus is ........ .

Heating white phosphorus with conc. $NaOH$ solution gives mainly

The reaction of $P_4$ with $X$ leads selectively to $P_4O_6$. The $X$ is

An inorganic salt $(A)$ is decomposed at about $523 \ K$ to give products $(B)$ and $(C).$ Compound $(C)$ is a liquid at room temperature and is neutral to litmus paper,while oxide $(B)$ on burning with white phosphorus,gives a dehydrating agent $(D).$ Compounds $(A)$,$(B)$,$(C)$ and $(D)$ will be identified as:

Which of the following oxides undergoes disproportionation with $NaOH$ solution?