For the reaction $Br_2 + F_2$ (excess) $\rightarrow P$, the molecular formula and structure of $P$, respectively, are

Which of the following statements is not true?

With reference to aqua regia,choose the correct option$(s)$.
$(1)$ Reaction of gold with aqua regia produces $NO_2$ in the absence of air.
$(2)$ Aqua regia is prepared by mixing conc. $HCl$ and conc. $HNO_3$ in $3:1$ $(v/v)$ ratio.
$(3)$ Reaction of gold with aqua regia produces an anion having $Au$ in $+3$ oxidation state.
$(4)$ The yellow colour of aqua regia is due to the presence of $NOCl$ and $Cl_2$.

The correct order of the thermal stability of hydrogen halides $(HX)$ is:

Which of the following can not undergo hydrolysis?

Which of the following is not a characteristic of interhalogen compounds?