Which of the following carbocations is likely to rearrange? A) I B) II C) III D)

Question

Which of the following carbocations is likely to rearrange? A) I B) II C) III D)IV E) II and IV What reagents are needed to accomplish the following transformation? A) H_2 O/H^+ B) H_2 O/Peroxide C) OH^- D) BH_3, E) I BH_3 2. HO^-, H_2 O_2. What reagents can best be used to accomplish the following transformation? 1. BH_3THF 2. HO^-, H_2 O_2 B) H^-, H_2 O C) I. Hg(OAc)_2, H_2O/THF 2. NaBH_4 D) 1. Hg(O_2CCF_3)_2, CH_3OH 2. NaBH_4 E) NaOH, H_2O Upon hydrogenation, which of the following alkenes releases the least heat per mole? A) 3, 4-dimethyl-1-hexene B) (Z)-3, 4-dimethyl-2-hexene C) (E)-3, 4-dimethyl-2-hexene D) (Z)-3, 4-dimethyl-3-hexene E)(E)-3, 4-dimethyl-3-hexene Which of the following are the elimination products of the reaction shown below? A) CH_3 CH_2 Br + -OH rightarrow A) CH_3 CH_2 Br + H + O- B) HOCH_2 CH_2 Br C) CH_2 CH_2 OH + Br- D) CH_2-CH_2 + Br- H2O E) CH_2 -CHBr + H2O What is the major organic product of the following reaction? A) 2, 3-dimethyl-1-hexene B)2, 3-dimethyl-2-hexene C) 2-isopropyl-1-pentene D) (Z)-2, 3-dimethyl-3-hexene E) (E) 2, 3-dimethyl-3-hexene Which of the following alkyl halides forms the most stable carbocation when it undergoes an E1 reaction? A) I B) II C) III D) IV

Explanation / Answer

Multiple choice

55. Carbocation that would rearrange,

D) IV

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56. Reagents needed

E)

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57. Reagents needed,

A)

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58. Least energy released by,

E)

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59. Product formed from elimination,

D)

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60. Product formed,

C)

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61. most stable carbocation,

D) IV

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