$A$ mixture of concentrated $HCl$ and concentrated $HNO_3$ in a $3:1$ ratio contains which of the following?

Observe the following reaction. This reaction represents:
$4 HCl + O_2 \xrightarrow[723 \ K]{CuCl_2} 2 Cl_2 + 2 H_2 O$

The correct statement$(s)$ regarding $(i) HClO$,$(ii) HClO_2$,$(iii) HClO_3$,and $(iv) HClO_4$ is(are):
$(A)$ The number of $Cl=O$ bonds in $(ii)$ and $(iii)$ together is two.
$(B)$ The number of lone pairs of electrons on $Cl$ in $(ii)$ and $(iii)$ together is three.
$(C)$ The hybridization of $Cl$ in $(iv)$ is $sp^3$.
$(D)$ Amongst $(i)$ to $(iv)$,the strongest acid is $(i)$.

The correct order of acidity of the following hydra acids is:

Among the oxyacids of chlorine,the order of acidic character is

When $Cl_2$ is passed through cold dil. $NaOH$,the products are: