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JEE Main levelSingle correct optionDifficulty 2 of 3cb124

On converting $N X_{2}$ to $N X_{2} X^{+}$ , the bond length and magnetic behaviour change as

Abond length decreases and the species stays diamagnetic
Bbond length decreases and the species becomes paramagnetic
Cbond length increases and the species becomes paramagnetic
Dbond length increases and the species stays diamagnetic

Answer: C

The electron is removed from the bonding

σ 2 p_{z}

orbital, so bond order falls from 3 to 2.5 and the bond lengthens. The remaining single electron in

σ 2 p_{z}

is unpaired, so

N X_{2} X^{+}

is paramagnetic.

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