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Features of MOT

According to ...

Question

According to Molecular Orbital Theory

C_{2}^{2 -}

is expected to be diamagnetic

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O_{2}^{2 +}

expected to have a longer bond length than

O_{2}

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N_{2}^{+}

and

N_{2}^{-}

have the same bond order

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H e_{2}^{+}

has the same energy as two isolated

H e

atoms

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Solution

The correct options are
A $C_{2}^{2 -}$ is expected to be diamagnetic
C $N_{2}^{+}$ and $N_{2}^{-}$ have the same bond order
Total number of electrons in $C_{2}^{2 -}$ is 14 and is diamagnetic according to MOT:
$σ_{1 s^{2}} σ_{1 s^{2}}^{} σ_{2 s^{2}} σ_{2 s^{2}}^{}$ $π_{2 p_{x}^{2}} π_{2 p_{y}^{2}} σ_{2 p_{x}^{2}}$ .
$O_{2}^{2 +}$ is having a bond order of 3 while $O_{2}$ has a bond order of 2 and thus $O_{2}$ is expected to have a longer bond length than $O_{2}^{2 +}$ .

Bond order of $N_{2}^{+}$ = bond order of $N_{2}^{-}$ = 2.5

Bond order of $H e_{2}^{+}$ is 0.5 and there will be some energy change during the formation of $H e_{2}^{+}$ from two isolated $H e$ atoms.

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Question 19

Which of the following statement is not correct from the view point molecular orbital theory?

(a) $B e_{2}$ is not a stable molecule

(b) $H e_{2}$ is not stable but $H e_{2}^{+}$ is expected to exist.

(d) The order of energies of molecular orbitals in $N_{2}$ molecule is

$σ 2 s < σ^{*} 2 s < σ 2 p_{z} < (π^{*} 2 p_{x} ≃ π^{*} 2 p_{y}) < σ^{*} 2 p_{z}$

Δ

Δ^{'}

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