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JEE Advanced levelSingle correct optionDifficulty 3 of 3ph076

Iodine trichloride combines with chloride ion as $ICl X_{3} + Cl X^{-} ICl X_{4} X^{-}$ . Which statement correctly describes the change at iodine?

AShape and hybridisation are unchanged; only the charge changes
BShape changes from T-shaped to square planar and the number of lone pairs on iodine falls from two to one
CShape changes from T-shaped to square planar, hybridisation from $s p^{3} d$ to $s p^{3} d^{2}$ , and iodine keeps two lone pairs
DShape changes from T-shaped to tetrahedral and iodine keeps two lone pairs

Answer: C

ICl X_{3}

has 3 bond pairs + 2 lone pairs (

s p^{3} d

, T-shaped).

ICl X_{4} X^{-}

has 4 bond pairs + 2 lone pairs, six pairs in all (

s p^{3} d^{2}

), and the lone pairs lie trans to each other giving a square planar ion. The number of lone pairs stays two.

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