JEE Advanced 2025 Paper 2, Chemistry Section 1 Q2: Group 17 Elements: The Halogen Family

JEE Advanced2025Paper 2Chemistry Section 1

The complete hydrolysis of ICl, ClF $_{3}$ and BrF $_{5}$ , respectively, gives

A
IO $^{-}$ , ClO $_{2}^{-}$ and BrO $_{3}^{-}$
B
IO $_{3}^{-}$ , ClO $_{2}^{-}$ and BrO $_{3}^{-}$
C
IO $^{-}$ , ClO $^{-}$ and BrO $_{2}^{-}$
D
IO $_{3}^{-}$ , ClO $_{4}^{-}$ and BrO $_{2}^{-}$

Solution

Interhalogens hydrolyse such that the less electronegative central halogen ends up bonded to oxygen in an oxoacid, whose conjugate base form is given by the question. The oxidation state of the central halogen in the starting interhalogen is preserved (loosely: number of $F$ / $C l$ on the central atom equals the number of $O$ -bonds in the product oxoanion).

ICl (I in +1): ICl + H $_{2}$ O $\to$ HIO + HCl, conjugate base IO $^{-}$ (hypoiodite).

ClF $_{3}$ (Cl in +3): ClF $_{3}$ + 2H $_{2}$ O $\to$ HClO $_{2}$ + 3HF, conjugate base ClO $_{2}^{-}$ (chlorite).

BrF $_{5}$ (Br in +5): BrF $_{5}$ + 3H $_{2}$ O $\to$ HBrO $_{3}$ + 5HF, conjugate base BrO $_{3}^{-}$ (bromate).

$∴$ Option (A) is correct.

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JEE Advanced 2025 Paper 2, Chemistry Section 1 Q2: Group 17 Elements: The Halogen Family

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