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JEE Main levelSingle correct optionDifficulty 2 of 3ph210

Polyhalide ions have the largest (least electronegative) halogen as the central atom. Which of the following ions is therefore NOT expected to exist?

A $ClI X_{2} X^{-}$
B $ICl X_{4} X^{-}$
C $IBr X_{2} X^{-}$
D $I X_{3} X^{-}$

Answer: A

In a polyhalide ion, the larger and more polarisable halogen is the central atom, bonded to the smaller and more electronegative atoms. In

ClI X_{2} X^{-}

the small Cl would have to be central with two larger I atoms, which is not favoured.

ICl X_{4} X^{-}

,

IBr X_{2} X^{-}

and

I X_{3} X^{-}

all have iodine at the centre.

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