Note: the last resonance form shouldn't have an H on it!

For Question 4: (a) IntA is a tert-butyl radical, and IntB is an isobutyl radical (can't draw them here yet!)
Remaining parts would not be on the 2003 summer exam #1:
(b) You draw a line starting from the energy level of the starting material, going up to the energy level of each intermediate IntA and IntB, giving two different act. energies for the pathways A & B.
(c) WIll be on test #2, don't worry about this for now.
(d) There is no part (d)!
(e) The product from A, 2-chloro-2-methylpropane, is the most stable, because it is at a position of lower energy on the right hand side of the diagram. This is confirmed if you do the calculations in (d). This product is also formed more quickly than the other product (1-chloro-2-methylpropane).

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