In which of the following molecules do the pi | vedclass

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Question

(A, B, D) The energy order of molecular orbitals for molecules with $14$ or fewer electrons (like $N_2$) is: $\sigma 1s < \sigma^* 1s < \sigma 2s < \s

Vedclass · Accepted Answer

$F_2$

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(A, B, D) The energy order of molecular orbitals for molecules with $14$ or fewer electrons (like $N_2$) is: $\sigma 1s In this sequence,the $\pi 2p_x$ and $\pi 2p_y$ orbitals fill before the $\sigma 2p_z$ orbital.For molecules with more than $14$ electrons (like $O_2, F_2, Ne_2$),the energy order is: $\sigma 1s In this case,the $\pi 2p_x$ and $\pi 2p_y$ orbitals fill after the $\sigma 2p_z$ orbital.Among the given options,$O_2$ ($16$ electrons),$Ne_2$ ($20$ electrons),and $F_2$ ($18$ electrons) follow this order. However,usually,such questions look for the specific case where the $\sigma 2p_z$ is lower in energy than $\pi 2p$ orbitals. Since $O_2, F_2, Ne_2$ all follow this,the question implies identifying the group. Given the standard options,$O_2, F_2, Ne_2$ all satisfy the condition.

In which of the following molecules do the $\pi 2p_x$ and $\pi 2p_y$ orbitals fill after the $\sigma 2p_z$ molecular orbital?

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