Which one of the following represents the lowest energy $\pi$-bonding molecular orbital of 1,3-butadiene?

Name: Which one of the following represents the lowest energy $\pi$-bonding molecular orbital of 1,3-butadiene?
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Question

Which one of the following represents the lowest energy  $\pi$-bonding molecular orbital of 1,3-butadiene?

Quizplus · Accepted Answer

This is the pi bonding molecular orbital between the two central carbon atoms, with two nodes. It is the lowest energy MO because it has the most overlap between the two p orbitals, and therefore the greatest stabilization of the molecule.

Which One of the Following Represents the Lowest Energy π\piπ -Bonding Molecular Orbital of 1,3-Butadiene? A) I B) II

Which One of the Following Represents the Lowest Energy $\pi$ -Bonding Molecular Orbital of 1,3-Butadiene?
A) I
B) II