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JEE Main levelSingle correct optionDifficulty 2 of 3cb123

Which statement about $B X_{2}$ and $C X_{2}$ is correct according to MO theory?

A $B X_{2}$ is diamagnetic and $C X_{2}$ is paramagnetic
BBoth are diamagnetic
C $B X_{2}$ is paramagnetic and $C X_{2}$ is diamagnetic
DBoth are paramagnetic

Answer: C

For

B X_{2}

(6 valence electrons) the last two electrons occupy degenerate

π 2 p_{x}

and

π 2 p_{y}

singly, giving two unpaired electrons. For

C X_{2}

(8 valence electrons) these

π

orbitals are filled with paired electrons, so it is diamagnetic.

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