Which of the following is isoelectronic pair?


ISOELECTRONIC SPECIES: the ions or elements which have same number of electrons are called isoelectronic species.


Number of electrons in the given species;


ICl2 : 53 + 2*17 = 87


ClO2 ; 17 + 16 = 33


Therefore number of electrons is not same. Hence it cannot be isoelectronic pair.


BrO2 : 35 + 2*8 + 1 = 52


BrF2: 35 + 9*2 -1 = 52


Therefore number of electrons is same. Hence it is a isoelectronic pair.


ClO2 : 17 + 16 = 33


BrF : 35 + 9 = 44


Therefore number of electrons is not same. Hence it cannot be isoelectronic pair.


CN- : 6+7+1 = 14


O3 : 8*3 = 24


Therefore number of electrons is not same. Hence it cannot be isoelectronic pair.


Hence the correct option is (ii).

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