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JEE Main levelSingle correct optionDifficulty 2 of 3cb090

Which statement is correct about removing one electron from the neutral molecule (MO theory)?

AThe bond length decreases in both cases
BThe bond length decreases for $N X_{2} N X_{2} X^{+}$ and increases for $O X_{2} O X_{2} X^{+}$
CThe bond length increases for $N X_{2} N X_{2} X^{+}$ and decreases for $O X_{2} O X_{2} X^{+}$
DThe bond length increases in both cases

Answer: C

The electron leaves a bonding orbital in

N X_{2}

, so bond order falls from 3 to 2.5 and the bond lengthens. In

O X_{2}

it leaves an antibonding

π^{*}

orbital, so bond order rises from 2 to 2.5 and the bond shortens.

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