The species having no $p \pi - p \pi$ bond but has bond order equal to that of $O_2$ 

  • A

    $ClO^-_3$

  • B

    $PO^{3-}_4$

  • C

    $SO^{2-}_4$

  • D

    $XeO_3$

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Polarization of electrons in acrolein may be written as

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