The halogen acid used in the preparation of aqua regia is

Mercury on heating with aqua-regia gives

When $SbF_5$ reacts with $XeF_4$ to form an adduct,the shapes of cation and anion in the adduct respectively are

Nitric acid converts iodine into

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ $ICl$ is more reactive than $I_{2}.$
Reason $(R):$ $I-Cl$ bond is weaker than $I-I$ bond.
In the light of the above statements,choose the most appropriate answer from the options given below:

What is the reason for the bleaching action of chlorine?