Which of the following allotropes of phosphorus is the most stable,has a graphite-like structure,and is a conductor of electricity?

White phosphorus,when heated with conc. $NaOH$ solution in an inert atmosphere of $CO_2$,forms phosphine and a sodium salt of oxoacid of phosphorus,$'X'$. The oxidation state of phosphorus in $'X'$ is

Match the List-$I$ with List-$II$.

List-$I$ (Family)	List-$II$ (Symbol of Element)
$A$. Pnictogen (group $15$)	$I$. $Ts$
$B$. Chalcogen	$II$. $Og$
$C$. Halogen	$III$. $Lv$
$D$. Noble gas	$IV$. $Mc$

Choose the correct answer from the options given below:

Which of the following is the anhydride of nitrous acid?

Pentavalency in phosphorus is more stable when compared to that of nitrogen,even though they belong to the same group. This is due to:

Due to $p\pi - p\pi$ bonding interactions, nitrogen forms $N_2$ but phosphorus forms $X$ and does not form a diatomic molecule. Identify $X$.