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NEET levelSingle correct optionDifficulty 1 of 3cb112

Which of the following molecules is paramagnetic according to molecular orbital theory?

A $N X_{2}$
B $C X_{2}$
C $F X_{2}$
D $O X_{2}$

Answer: D

O X_{2}

has two unpaired electrons, one in each of the degenerate

π^{*} 2 p_{x}

and

π^{*} 2 p_{y}

orbitals.

N X_{2}

,

C X_{2}

and

F X_{2}

have all electrons paired and are diamagnetic.

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