Which of the following compounds releases nitrogen dioxide $(NO_2)$ upon heating?

In which of the following compounds does hydrolysis take place through $S_N^1$ and $S_N^2$ mechanisms respectively?

Define the order of $d_{P-O}$ (single bond length) in the given compounds $X$ and $Y$:
$P_4 \xrightarrow{O_2} 'X'$
$P_4 \xrightarrow{O_2 \text{ (excess)}} 'Y'$

Consider the following Assertion $(A)$: Phosphorus can form both phosphorus$(III)$ and phosphorus$(V)$ chlorides, but nitrogen cannot form nitrogen$(V)$ chloride. Reason $(R)$: The electronegativity of nitrogen is more than that of phosphorus. The correct answer is

In which oxidation state,group $15$ elements act as Lewis base?

Which of the following is a liquid obtained from an equimolar mixture of two gases at $-30\,^oC$?