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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb145

Which set contains species that all have the same bond order and are all diamagnetic?

A $O X_{2} X^{2 -}$ , $F X_{2}$ , $B X_{2}$
B $N X_{2}$ , $N X_{2} X^{+}$ , $CN X^{-}$
C $CO$ , $CN X^{-}$ , $NO X^{+}$
D $C X_{2}$ , $O X_{2}$ , $NO$

Answer: C

CO

,

CN X^{-}

and

NO X^{+}

each have 10 valence electrons: bond order 3, all paired. In the second set

B X_{2}

is paramagnetic; the third set has bond orders 2, 2, 2.5; in the fourth

N X_{2} X^{+}

has bond order 2.5 and is paramagnetic.

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