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  • Try this! - According to molecular orbital theory, which of the following is true with respect to and ? - Chemical Bonding and Molecular Structure - JEE Main

According to molecular orbital theory, which of the following is true with respect toLi_{2}^{+}   and Li_{2}^{-}?

  • Option 1)

    Li_{2}^{+}is unstable and isLi_{2}^{-} stable

  • Option 2)

    Li_{2}^{+}is stable andLi_{2}^{-} is unstable

  • Option 3)

    Both are stable

  • Option 4)

    Both are unstable

Answers (1)

best_answer

 

Molecular Orbital Theory ( M.O.T ) -

Molecular orbital ( M.O ) Theory was developed by F Hund and  R.S Mulliken in 1932.

-

 

 

Features of Molecular Orbital Theory -

1.  Bonding molecular orbital has lower energy and hence greater stability than corresponding antibonding molecular orbital.

2.  The electron probability distribution around a group of nuclei in a molecule is given by molecular orbital.

3.  electrons in a molecular orbital are filled in accordance with Aufbau principle, obeying Pauli's exclusion principle and Hund's rule.

-

 

Salient Feature of Molecular orbital Theory -

1.  The electrons in a molecule are present in the various molecular orbitals as the electron of atoms are present in the various atomic orbitals.

2.  Atomic orbitals of comparable energies and proper symmetry combine to form molecular orbitals.

-as we know that:

 

Li^{+}_{2}\rightarrow 5_{e}^{-},\sigma 1s^{2}\sigma ^{*}1s^{2}\sigma 2s^{1}

Li^{-}_{2}\rightarrow 7_{e}^{-},\sigma 1s^{2}\sigma ^{*}1s^{2}\sigma 2s^{2}\sigma ^{*}2S^{1}

B.O. of Li^{+}_{2}=\frac{3-2}{2}= \frac{1}{2}

B.O. of Li^{-}_{2}=\frac{4-3}{2}= \frac{1}{2}

Both have same bond order because of no. of bonding electrons are more then unbonding electron so both are stable since they have B.O.

 

 


Option 1)

Li_{2}^{+}is unstable and isLi_{2}^{-} stable

Option 2)

Li_{2}^{+}is stable andLi_{2}^{-} is unstable

Option 3)

Both are stable

Option 4)

Both are unstable

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