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Chapter 16: PROBLEM 16.67 (page 639)

Question: Which of the following molecules absorbs a longer wavelength of UV light?

Short Answer

Expert verified

Answer

A

Step by step solution

01

UV light

The UV light falls between 200 nm and 400 nm. The radiation belonging to this region is colorless due to its very low wavelength.

02

Effect of conjugation on wavelength  

The conjugation increases the resonance, which decreases the energy and increases the wavelength

03

Explanation

Compound A has a longer wavelength of UV light due to the presence of more conjugated double bonds.

Conjugated double bond of A

Compound B has a shorter wavelength due to a less conjugated double bond.

Conjugated double bond of B

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Most popular questions from this chapter

Question: Draw the product (A) of the following Diels-Alder reaction. A was a key intermediate in the synthesis of the addicting pain reliever morphine, the chapter-opening molecule.

Question: Label each product in the following reaction as a 1,2-product or 1,4-product, and decide which is the kinetic product and which is the thermodynamic product.

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Question: Diels–Alder reaction of a monosubstituteddiene (such as CH2=CH-CH=CHOCH3) with a monosubstituteddienophile (such as CH2=CHCHO) gives a mixture of products, but the 1,2-disubstituted product often predominates. Draw the resonance hybrid for each reactant and use the charge distribution of the hybrids to explain why the 1,2-disubstituted product is the major product.

Question: A transannular Diels–Alder reaction is an intramolecular reaction that occurs when the diene and dienophile are contained in one ring, resulting in the formation of a tricyclic ring system. Draw the product formed when the following triene undergoes a transannular Diels–Alder reaction.
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