Chapter 31: Question 31.10 (page 1246)
Locate the isoprene units in each compound.
a.

b.

c.

d.

Short Answer
Answer
a.

b.

c.

d.

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Chapter 31: Question 31.10 (page 1246)
Locate the isoprene units in each compound.
a.

b.

c.

d.

Answer
a.

b.

c.

d.

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Question: An isoprene unit can be thought of as having a head and a tail. The 鈥渉ead鈥 of the isoprene unit is located at the end of the chain nearest the branch point, and the 鈥渢ail鈥 is located at the end of the carbon chain farthest from the branch point. Most isoprene units are connected together in a 鈥渉ead-to-tail鈥 fashion, as illustrated. For both lycopene (Problem 31.26), and squalene (Figure 31.9), decide which isoprene units are connected in a head-to-tail fashion and which are not.

Locate the isoprene units in each compound.
a.

b.

c.

d.

Draw the products formed when triacylglycerol A is treated with each reagent. Rank compounds A, B and C in order of increasing melting point.
a.,
b. (excess),
c.(1 equiv),
Consider separate 1.0-L samples of O2(g) and He(g), both at 25oC and the same pressure. Compare the change in momentum per impact and the number of impacts per second in the two samples.
Treatment of cholesterol with mCPBA results in formation of a single epoxide A, with the stereochemistry drawn. Why isn鈥檛 the isomeric epoxide B formed to any extent?

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