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Which of the following is isoelectronic pair?

1.	${ICl}_{2}$ , ${ClO}_{2}$	2.	${BrO}_{2}^{-}$ , ${BrF}_{2}^{+}$
3.	${ClO}_{2}$ , $BrF$	4.	${CN}^{-}$ , $O_{3}$

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