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Chapter 3: Q16 P-c. (page 85)

Sight along the C2-C1 bond of 2-methylpropane (isobutane).

(c) Make a graph of energy versus angle of rotation around the C2-C1 bond.

Short Answer

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(c)

Step by step solution

01

Graph of energy versus angle of rotation

The eclipsed conformation is less stable than the staggered conformation. This is because it comprises more potential energy due to the torsional strain.

02

Graph of energy versus angle of rotation around the C2-C1 bond

(c) A particular molecule’s stability is inversely related to its energy. Hence, the atom possessing less energy is more stable. The atom with high energy is least stable. The graph of energy versus the angle of rotation can be given as:

Graph of energy versus angle of rotation

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Most popular questions from this chapter

Identify the functional groups in the following model of arecoline, a veterinary drug used to control worms in animals. Convert the drawing into a line-bond structure and a molecular formula (red5O, blue5N).

Increased substitution around a bond leads to increased strain. Take the four substituted butanes listed below, for example. For each compound, sight along the C2–C3 bond and draw Newman projections of the most stable and least stable conformations. Use the data in Table 3-5 to assign strain-energy values to each conformation. Which of the eight conformations is most strained? Which is least strained?

(a) 2-Methylbutane

(b) 2,2-Dimethylbutane

(c) 2,3-Dimethylbutane

(d) 2,2,3-Trimethylbutane

Draw structures that meet the following descriptions (there are many

Possibilities):

(b) Two isomers with the formula C4H8O2

The cholesterol-lowering agents called statins, such as simvastatin (Zocor) and pravastatin (Pravachol), are among the most widely prescribed drugs in the world, with annual sales estimated at approximately $25 billion. Identify the functional groups in both, and tell how the two substances differ.

In the next chapter we’ll look at cycloalkanes—saturated cyclic hydrocarbons—and we’ll see that the molecules generally adopt puckered, nonplanar conformations. Cyclohexane, for instance, has a puckered shape like a lounge chair rather than a flat shape. Why?
See all solutions

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