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
(c)

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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.
(c)

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Draw a Newman projection along the C2-C3 bond of the following conformation of 2-butanol.
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
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?


Give IUPAC names for the following alkanes, and convert each drawing
into a skeletal structure.

How many isomers are there with the following descriptions?
(b) Bromoalkanes with the formulaC4H9Br
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