Which of the following is isoelectronic pair?

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Question:
Which of the following is isoelectronic pair?

(i) ICl2, ClO2

(ii) BrO2–, BrF2+

(iii) ClO2, BrF

(iv) CN–, O3

Solution:

Option (ii) BrO2–, BrF2+ is the answer.