Match the interhalogen compounds of column-I with the geometry in column-II and assign the correct code.

Column $${\rm I}$$			Column $${\rm I}$$$${\rm I}$$
(A)	XX'		(i)	T-shape
(B)	XX'3		(ii)	Pentagonal bipyramidal
(C)	XX'5		(iii)	Linear
(D)	XX'7		(iv)	Square pyramidal
			(v)	Tetrahedral

The correct increasing order of basic strength for the following compounds is

Name the gas that can readily decolourise acidified KMnO₄ solution.

HgCl₂ and I₂ both when dissolved in water containing I^$$-$$ ions, the pair of species formed is