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n2cute n2cute
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It is necessary to add ZnCl2 to promote the reaction of HCl with some alcohols while these same alcohols react with HBr quite readily. Explain.
Textbook 

Organic Chemistry


Edition: 9th
Authors:
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jjennaleighhjjennaleighh
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More questions for this book are available here
Cl- is a weaker nucleophile than is Br-. The Lewis acid ZnCl2 coordinates with the oxygen of the alcohol to increase its electrophilicity and make it a better leaving group.

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