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JEE Main levelSingle correct optionDifficulty 2 of 3cb094

Which of the following does NOT have a bond order of 3 (MO theory)?

A $CO$
B $NO$
C $CN X^{-}$
D $NO X^{+}$

Answer: B

CN X^{-}

,

CO

and

NO X^{+}

are isoelectronic with

N X_{2}

(10 valence electrons), so each has bond order 3.

NO

has 11 electrons, one in a

π^{*}

orbital, so its bond order is 2.5.

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