Which of the following molecules is/are dimagnetic ?

L i_{2}

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B_{2}

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C_{2}

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N_{2}

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Solution

The correct options are
B $C_{2}$
C $N_{2}$
D $L i_{2}$
Among the halides of lithium, $L i F$ has highest lattice energy due to similar sizes of cation and anion which results in efficient packing. in the crystal structure.
$L i_{2}$ , $C_{2}$ and $N_{2}$ are dimagnetic as they contain all paired electrons.
On the other hand $B_{2}$ is paramagnetic as it contains two unpaired electrons.

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