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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cb157

Which of the following species is/are paramagnetic with a bond order of 2.5?

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

Answer: A, B, D

O X_{2} X^{+}

(11 valence electrons): bond order 2.5, one unpaired electron.

N X_{2} X^{+}

(9): 2.5, one unpaired.

CN

(9): 2.5, one unpaired.

NO X^{+}

(10) has bond order 3 and is diamagnetic.

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