Vollhardt,Chapter25

Vollhardt,Chapter25 - Chapter 25: 1. What do the following...

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Chapter 25: 1. What do the following have in common: pyrrole and furan? a. Both are five-membered ring heterocycles that are still named with derivative carbocyclic names. b. Both are six-membered ring heterocycles that are still named with non- standard, common names. c. Both are five-membered ring heterocycles that are still named with non- standard, common names. d. Nothing; they have different structures. Answer: C 2. Why are ring structures smaller than five- or six-membered rings more reactive? a. They aren’t; there is a wealth of reaction chemistry based on five- and six- membered heterocyclic rings. b. Because of the ease of nucleophilic attack on accessible carbons. c. Because of electron delocalization and resonance. d. Because of the release of ring strain upon reacting. Answer: D 3. How are five-membered heterocyclic rings formed? a. Through dehydration of di-alcohols. b. Through hydration of di-ketones, thiols, or imines. c.
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Vollhardt,Chapter25 - Chapter 25: 1. What do the following...

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