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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: pallta on December 04, 2018, 09:10:18 AM

Title: Molecular orbital concept problem
Post by: pallta on December 04, 2018, 09:10:18 AM

Here is the problem:

Which of the following describes why there are two π, two π*, one σ and one σ* molecular orbitals formed from the constructive and deconstructive interference of two p subshells (three p orbitals on each atom)?

A) When two similar p orbitals on the internuclear axis interact, they form one σ and one σ* molecular orbitals. B) When two similar p orbitals perpendicular to the internuclear axis interact they form one π and one π* molecular orbitals.
C) When degenerate orbitals interact in the same way, they don’t form degenerate molecular orbitals.
D) Both A and B
E) A, B and C

The correct answer is D), but I'm not sure why. I've been trying to find info. online but it's very confusing. Any help would be appreciated!

Title: Re: Molecular orbital concept problem
Post by: mjc123 on December 05, 2018, 04:54:41 AM

Try visualising it. Draw two adjacent atoms and their p orbitals. How do you think they may interact?