Which of the following decreases down the halogen group?

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 number of interhalogens from the following having square pyramidal structure is.
$ClF_{3}, IF_{7}, BrF_{5}, BrF_{3}, I_{2}Cl_{6}, IF_{5}, ClF, ClF_{5}$

$Cl_{2(g)} + Ba(OH)_2 \to X (aq.) + BaCl_2 + H_2O$
$X + H_2SO_4 \to Y + BaSO_4$
$Y \xrightarrow[\Delta > 365 \ K]{\Delta } Z + H_2O + O_2$
$Y$ and $Z$ are respectively

Assertion : The fluorine has lower reactivity.
Reason : $F-F$ bond has low bond dissociation energy.

Which of the following processes cannot produce $Cl_2$ gas?