For each set of isomers, choose the isomer that you expect to be most stable and the isomer you expect to be least stable.
(b)

Of the compounds you named in Problem 45:

b. Which is the least stable?

a.

b.

c.

d.

e.

f.

Which species in each pair is more stable?

c.

d.

Use the data in Table 7-2 to predict the energy difference between 2,3-dimethylbut-1-ene and 2,3-dimethylbut-2-ene. Which of these double-bond isomers is more stable?

Explain why each of the following alkenes is stable or unstable.

(h)

(i)

For each set of isomers, choose the isomer that you expect to be most stable and the isomer you expect to be least stable.

(c)

In 1935, J. Bredt, a German chemist, proposed that a bicycloalkene could not have a double bond at a bridgehead carbon unless one of the rings contains at least eight carbons. This is known as Bredt's rule. Explain why there cannot be a double bond at this position.

When the alkyne ${\mathrm{CH}}_3-C\equiv C-{\mathrm{CH}}_3$ is treated with ozone followed by water, how many carboxylic acid products are formed?

Which of the following is the correct structure for $3-\mathrm{hex}\mathrm{yne}$?