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Which of the following has the highest v...

Which of the following has the highest value of ë max in the ultraviolet-visible spectrum?

A

2

B

1

C

4

D

3

Text Solution

Verified by Experts

The correct Answer is:
B
A higher value of ëmax corresponds to a lower frequency of light and a smaller energy difference between energy levels in a molecule. Conjugation of the two bonds in the 1,3-diene results in a decrease in the gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) compared to an isolated alkene.
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