$SO_2$ acts as a temporary bleaching agent,whereas $Cl_2$ acts as a permanent bleaching agent. Why?

$Fluorine$ does not form positive oxidation states because

Compound $A$ and $B$ respectively are :-
$Cl_2 + 2NaOH (cold \& dil.) \rightarrow A + NaCl + H_2O$
$3Cl_2 + 6NaOH (hot \& conc.) \rightarrow B + 5NaCl + 3H_2O$

Sodium chloride when heated with conc. $H_2SO_4$ and solid potassium dichromate gives

$A$ radioactive element resembling iodine in properties is

With respect to hypochlorite,chlorate,and perchlorate ions,choose the correct statement$(s)$.
$A.$ The hypochlorite ion is the strongest conjugate base.
$B.$ The molecular shape of only the chlorate ion is influenced by the lone pair of electrons on $Cl$.
$C.$ The hypochlorite and chlorate ions disproportionate to give rise to an identical set of ions.
$D.$ The hypochlorite ion oxidizes the sulfite ion.