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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 additional resonance structures for each ion.

a.

b.

c.

d.

Question: Zingiberene and 尾-sesquiphellandrene, natural products obtained from ginger root, contain conjugated diene units. Which diene reacts faster in the Diels鈥揂lder reaction and why?

Question. Draw the structure consistent with each description.

a. (2E,4E)-octa-2,4-diene in the s-trans conformation

b. (3E,5Z)-nona-3,5-diene in the s-cis conformation

c. (3Z,5Z)-4,5-dimethyldeca-3,5-diene. Draw both the s-cis and s-trans conformations.

Question:(a) Which triene has the largest heat of hydrogenation?(b) Which triene has the smallest heat of hydrogenation?(c) Which triene absorbs the longest wavelength of UV light?(d) Which triene is most reactive in the Diels-Alder reaction?

Question: Which diene in each pair has the larger heat of hydrogenation?

a.

or

b.

or

See all solutions

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