According to molecular orbital theory, the paramagnetism of ${O_2}$ molecule is due to presence of

  • A

    Unpaired electrons in the bonding $\sigma $ molecular orbital

  • B

    Unpaired electrons in the antibonding $\sigma $ molecular orbital

  • C

    Unpaired electron in the bonding $\pi $ molecular orbital

  • D

    Unpaired electrons in the antibonding $\pi $ molecular orbital

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