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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: Rank the following compounds in order of increasing stability.

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b.

c.

Question: The following reactions have been used to synthesize dieldrin and aldrin (named for Diels and Alder), two pesticides having a similar story to DDT (Section 7.4). Identify the lettered compounds in this reaction scheme.

Question: What diene and dienophile are needed to prepare each Diels–Alder product?

a.

b.

c.

d.

Question: Treatment of alkenes A and B with HBr gives the same alkyl halide C. Draw a mechanism for each reaction, including all reasonable resonance structures for any intermediate.

Question: Which of the following systems are conjugated?

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b.

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e.

f.
See all solutions

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