The paramagnetic behaviour of $B_2$ is due to the presence of
- Atwo unpaired electrons in $\pi^*$ $MO$
- Btwo unpaired electrons in $\pi$ $MO$
- Ctwo unpaired electrons in $\sigma$ $MO$
- Dtwo unpaired electrons in $\sigma^*$ $MO$
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The ground state electronic configuration of $CO$ molecule is
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| $2$. $CO$ | $ii$. $2.0$ |
| $3$. $O_2^{-}$ | $iii$. $2.5$ |
| $4$. $O_2$ | $iv$. $3.0$ |
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