1. Multiple choice. Choose the letter of the best answer. (16 pts) 1). Choose th

Question

1. Multiple choice. Choose the letter of the best answer. (16 pts) 1). Choose the incorrect statement about reactions of haloalkanes proceeding by SN2 mechanisms. (A) The order of reactivity of the haloalkane is the following: methyl (fastest) 1° >2 >3 (3) Rearrangements are common. (C) Inversion of configuration occurs at the site of substitution. (E) The reaction rate is generally faster in polar aprotic solvents. 2) Which of the following will give the transformation shown? B. water with acid as catalyst A. C12, H20 D. BH, THF followed by Hao2, oH C. Hg(OAC)2, water 3) Which of the following alkene addition reaction is regiospecific? (a) hydrohalogenation (H-X) (b) acid-catalyzed hydration (c) hydroboration/oxidation (d) all are regiospecific (e) None of the above 4). Which of the following reaction is stereoselective? (a) halogenation (H-X) (b) oxymercuration/reduction (c) hydroboration/oxidation (d) all are stereoselective (e) None of the above 5) Which carbocation is the least stable? A)

Explanation / Answer

1. B) Rearrangements are common: This is the incorrect statement about SN2 reaction because it is depend on the stability of the carbocation.

2. D) BH3, THF followed by H2O2, OH-will give less substituted alcohol

3. e) None of the reaction mentioned i.e hydrohalogenation, acid catalyzed hydration, hydrboration-oxidation are regiospecific. All are regioselective

4. c) Hydrboration-oxidation is only stereoslective among the reactions mentioned

5. A) Methyl cation is the least stable one. All others are more stable than this as they are seconadry or tertiary

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