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12. Which of the following alcohols dehydrates with the fastest rate? CH3 HO HO CH3(D) OH CH, (B) CH2OH OH CH3 13. Why would concentrated hydrobromic acid be an inappropriate catalyst for the dehydration of alcohols? (A) HBr is too weakly acidic to protonate the alcohol. (B) The conjugate base, Br, is a good nucleophile and it would attack the carbocation to form an alkyl bromide. (C) HBr is strongly acidic, so the water molecule would not be a good leaving group after protonation of the alcohol (D) uBr would be more likely to promote rearrangement of the carbocation intermediate
12. Which of the following alcohols dehydrates with the fastest rate? CH3 HO HO CH3(D) OH CH, (B) CH2OH OH CH3 13. Why would concentrated hydrobromic acid be an inappropriate catalyst for the dehydration of alcohols? (A) HBr is too weakly acidic to protonate the alcohol. (B) The conjugate base, Br, is a good nucleophile and it would attack the carbocation to form an alkyl bromide. (C) HBr is strongly acidic, so the water molecule would not be a good leaving group after protonation of the alcohol (D) uBr would be more likely to promote rearrangement of the carbocation intermediate
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