Which of the following molecules/ ions does not contain unpaired electrons?

  • Option 1)

    O{_{2}}^{2-}

  • Option 2)

    B_{2}

  • Option 3)

    N{_{2}}^{+}

  • Option 4)

    O_{2}

 

Answers (1)

As we learnt in 

Magnetic behaviour of molecule -

If  all the molecular orbitals in a molecule are doubly occupied, the substance is diamagnetic

- wherein

However if one or more molecular orbital are singly occupied it is paramagnetic e.g. O2

 

 

The molecular orbital configuration of O_{2}^{2-} ion is

Here KKepresents non­bonding molecular orbital of 1s orbital.

O{_{2}}^{2-}contains no unpaired electrons.

 

The molecular orbital configuration of B2 molecule is

It contains 2 unpaired electrons.

 

The molecular orbital configuration of N{_{2}}^{+} ion is

It contains one unpaired electron.

The molecular orbital configuration of O_{2} molecule is

It contains 2 unpaired electrons.

 

 

 


Option 1)

O{_{2}}^{2-}

This option is correct

Option 2)

B_{2}

This option is incorrect

Option 3)

N{_{2}}^{+}

This option is incorrect

Option 4)

O_{2}

This option is incorrect

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