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Chapter 1 Practice Problems Answer Key

Chapter 1 Practice Problems Answer Key - Chapter 1 Practice...

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Chapter 1 Practice Problems Answer Key
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Challenge Problem #4: a. A structure with a positive charge on a carbon immediately adjacent to an alkene is termed an allylic carbocation. Shifting the electrons gives us the only other reasonable resonance structure. b. This molecule is toluene. The functional group is a benzene ring. Shifting all three double bonds provides the only other reasonable resonance structure. This resonance has a profound influence on the extra stability associated with the benzene ring (Chapter 9 of the text). The direction of the electron flow (clockwise or counterclockwise) does not matter, as it gets us to the same place. c. A structure with a positive charge on a carbon immediately adjacent to a benzene ring is termed a benzylic carbocation. It has several resonance forms that arise from shifting the position of the positive charge as well as shifting the position of the double bonds within the benzene ring as in the previous problem.
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