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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
Among the following ions the $p\pi  - d\pi $ overlap could be present in
  • A
    $NO_2^ - $
  • B
    $NO_3^ - $
  • ✓
    $PO_4^{ - 3}$
  • D
    $CO_3^{ - 2}$
✓

Answer

Correct option: C.
$PO_4^{ - 3}$
c
In $P=O$ bond, $\pi$ - bond is formed by the sidewise overlapping of $d$ - orbital of $P$ and $p$ - orbital of oxygen. Hence, it is formed by $p \pi$ and $d\pi$ overlapping.

In nitrogen and carbon, no vacant $d$-orbital is present. So, they do not form $p \pi- d \pi$ bond.

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