Which of the following carbocations would be likely to rearrange? Draw each rearranged structure below.
Molecule I

Which of the following carbocations would you expect to rearrange? If you expect rearrangement, draw the carbocation you expect to form and the mechanism by which it will form.

(b)

Which of the following carbocations would you expect to rearrange? If you expect rearrangement, draw the carbocation you expect to form and the mechanism by which it will form.

(e)

Which of the following carbocations would you expect to rearrange? If you expect rearrangement, draw the carbocation you expect to form and the mechanism by which it will form.

(e)

Our wayward chemist from Assessment 8.23 suggested the following stepwise mechanism for a hydride shift. Show this mechanism on a reaction coordinate diagram to illustrate why the concerted mechanism is more likely. Justify the picture you have drawn.

Which of the following carbocations would be likely to rearrange? Draw each rearranged structure below.

Molecule II

Which of the following carbocations would be likely to rearrange? Draw each rearranged structure below.

Molecule III

Which of the following carbocations would be likely to rearrange? Draw each rearranged structure below.

Molecule IV

Two of the carbocations in Problem 6-42 are prone to rearrangement. Show how they might rearrange to more stable ­carbocations.