Identify the more stable carbocation in each pair.
(b)

For each pair of reactions, predict which will happen more quickly. [For (c) and (d), the more substituted carbocation is more stable due to hyperconjugation.]

(c)

For each set of reactive intermediates, rank them in order of reactivity (1 = most reactive).

(c)

Rank the following carbocations in order of stability (1 = most stable; 5 = least stable ). Explain your order.

Identify the more stable carbocation in each pair.

(a)

Which of the carbocations in part a is most stable?

1. the isobutyl cation?

2. the n-butyl cation?

3. the sec-butyl cation?

Which of the following carbocations is the most stable?

Which of the following is the most stable carbocation?

Which of the following factors most significantly contribute to the stability of a $\mathrm{carbocation}$?