6. Thermodynamics and Kinetics

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)

Identify the more stable carbocation in each pair.

(b)

Which of the carbocations in part a is most stable?

1. the isobutyl cation?

2. the n-butyl cation?

3. the sec-butyl cation?