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ProblemsChapter 25

ProblemsChapter 25 - 1 Which nitrogen if either is the more...

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1. Which nitrogen, if either, is the more basic in nicotine? N N CH 3 H A B nicotine A) Nitrogen A is more basic. B) Nitrogen B is more basic. C) The nitrogens are equally basic. D) Neither nitrogen is basic. E) There is no basis on which to predict this. Ans 2. Which of the following shows the structure of protonated pyrrole? N H H + ? N H H H + N H H H + N H H + N H + H H Page 1
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3. How would the heterocyclic amines shown here be ranked in order of decreasing basicity (more basic > less basic)? N N N H H I II III Ans 4. What product do you expect from the reaction shown below? N NO 2 N SO 3 H N NO 2 N SO 3 H N NO 2 Page 2
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6. Rank the following heterocycles in decreasing order of reactivity in electrophilic aromatic substitution: O S N I II III H A) I > II > III B) II > I > III C) III > I >> II D) III > II > I E) I > III > II Ans:
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