Question

Which of the following statements is correct?

पर्याय

• In the formation of dioxygen from oxygen atoms 10 molecular orbitals will be formed.

• All the molecular orbitals in the dioxygen will be completely filled.

• Total number of bonding molecular orbitals will not be same as total number of anti bonding orbitals in dioxygen.

• Number of filled bonding orbitals will be same as number of filled anti bonding orbitals.

Answer 1

Total number of bonding molecular orbitals will not be same as total number of anti bonding orbitals in dioxygen.

Explanation:

(i) The electronic configuration of dioxygen is:

`σ1s^2, σ^∗1s^2, σ2s^2, σ^∗2s^2, σ2p_z^2, π2p_x^2, π2p_y^2, π^∗2p_x^1, π^∗2p_y^1`

Only nine molecular orbitals are formed. So, the statement given is incorrect. 

(ii) As it can be seen from the electronic configuration of oxygen atom the `π^∗2p_x^1, π^∗2p_y^1` are partially. So, the statement given is incorrect.

(iii) The statement given is correct because there are five bonding molecular orbitals and four antibonding molecular orbital in oxygen molecules. Hence, the bonding and antibonding molecular orbitals are no equal.

(iv) The filled bonding orbitals are not the same as the number of filled antibonding orbitals. The filled bonding orbitals are five and only two filled antibonding orbitals are present in dioxygen molecules.