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JEE Main levelSingle correct optionDifficulty 2 of 3cb122

Which of the following species has a bond order of 3 according to MO theory?

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

Answer: D

NO X^{+}

has

5 + 6 - 1 = 10

valence electrons, isoelectronic with

N X_{2}

, bond order 3. The others have bond orders

O X_{2} X^{2 -}

= 1,

C X_{2}

= 2,

B X_{2}

= 1.

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