Answer to Question #85841 in Organic Chemistry for anuj

Question #85841
The λmax value for ethene is 175 nm whereas that for 1,3-butadiene is 217 nm.
Expert's answer

For butadiene-1,3 energy gap between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) is smaller than in ethene. Addition of successive conjugated double bonds progressively narrows the gap between HOMO and LUMO.Thus longer wavelength (lower energy) radiation required for the transition

3D picture of molecular orbital diagram is available on link:

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Assignment Expert
19.04.19, 08:20

Dear Gayatri, Questions in this section are answered for free. We can't fulfill them all and there is no guarantee of answering certain question but we are doing our best. And if answer is published it means it was attentively checked by experts. You can try it yourself by publishing your question. Although if you have serious assignment that requires large amount of work and hence cannot be done for free you can submit it as assignment and our experts will surely assist you.

11.03.19, 18:02

plz do it fast

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