Which of the following alkenes is the most stable?

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 $3-\mathrm{hex}\mathrm{yne}$?

Which of the following alkenes is the most stable?

Which of the following is the most stable alkene?

When $3$-bromo-$3$-methylheptane is treated with a strong base, how many different alkenes (constitutional isomers) can be formed as major products via E$2$ elimination?

Which of the following alkenes would you expect to have the lowest heat of hydrogenation?