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

Question

Which of the following statements is not correct from the view point of molecular orbital theory? (A) Be2 is not a stable molecule. (B) He2 is not stable but He2 is expected to exist. (C) Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period. (D) The order of energies of molecular orbitals in mathrmN2 molecule is σ 2 s<σ* 2 s<σ 2 pz<(π 2 px=π 2 py)<(π* 2 px. .=π* 2 py)<σ* 2 pz

Tardigrade Admin · Accepted Answer

For mathrmN2, σ 2 pz has higher energy than π 2 px and π 2 py hence, the correct order will be σ2s, σ* 2 s, π 2 px=π 2 py, σ 2 pz, π* 2 px=π* 2 py, σ star 2 pz

Q. Which of the following statements is not correct from the view point of molecular orbital theory?

$B e_{2}$ is not a stable molecule.

$H e_{2}$ is not stable but $H e_{2}$ is expected to exist.

Bond strength of $N_{2}$ is maximum amongst the homonuclear diatomic molecules belonging to the second period.

The order of energies of molecular orbitals in $N_{2}$ molecule is $σ 2 s < σ^{} 2 s < σ 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{} 2 p_{x}$ $= π^{} 2 p_{y}) < σ^{} 2 p_{z}$

For $N_{2}, σ 2 p_{z}$ has higher energy than $π 2 p_{x}$ and $π 2 p_{y}$ hence, the correct order will be
$σ 2 s, σ^{} 2 s, π 2 p_{x} = π 2 p_{y}, σ 2 p_{z}, π^{} 2 p_{x} = π^{*} 2 p_{y}, σ^{⋆} 2 p_{z}$

Q. Which of the following statements is not correct from the view point of molecular orbital theory?

Be2​ is not a stable molecule.

He2​ is not stable but He2​ is expected to exist.

Bond strength of N2​ is maximum amongst the homonuclear diatomic molecules belonging to the second period.

The order of energies of molecular orbitals in N2​ molecule is σ2s<σ∗2s<σ2pz​<(π2px​=π2py​)<(π∗2px​ =π∗2py​)<σ∗2pz​

For N2​,σ2pz​ has higher energy than π2px​ and π2py​ hence, the correct order will be σ2s,σ∗2s,π2px​=π2py​,σ2pz​,π∗2px​=π∗2py​,σ⋆2pz​

$B e_{2}$ is not a stable molecule.

$H e_{2}$ is not stable but $H e_{2}$ is expected to exist.

Bond strength of $N_{2}$ is maximum amongst the homonuclear diatomic molecules belonging to the second period.

The order of energies of molecular orbitals in $N_{2}$ molecule is $σ 2 s < σ^{} 2 s < σ 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{} 2 p_{x}$ $= π^{} 2 p_{y}) < σ^{} 2 p_{z}$

For $N_{2}, σ 2 p_{z}$ has higher energy than $π 2 p_{x}$ and $π 2 p_{y}$ hence, the correct order will be
$σ 2 s, σ^{} 2 s, π 2 p_{x} = π 2 p_{y}, σ 2 p_{z}, π^{} 2 p_{x} = π^{*} 2 p_{y}, σ^{⋆} 2 p_{z}$