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JEE Main levelSingle correct optionDifficulty 2 of 3pb188

Carbon monoxide is isoelectronic with which of the following, and what is its bond order from molecular orbital theory?

A $N X_{2}$ ; bond order 2
B $N X_{2}$ ; bond order 3
C $NO$ ; bond order 2.5
D $O X_{2}$ ; bond order 2

Answer: B

CO has 14 electrons, the same as

N X_{2}

. Its configuration is like that of

N X_{2}

, with 10 bonding and 4 antibonding electrons, so the bond order is (10 - 4)/2 = 3.

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