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

ID: 527351 • Letter: W

Question

Which of the following carbocations is likely to rearrange? A) I B) II C) II D) IV E) II and IV What reagents are needed to accomplish the following transformation? A) H_2OH^+ B) H_2O Peroxide C) OH D) BH_3 E) I, BH_3, 2. HO^-, H_2O_2. What reagents can best be used to accomplish the following transformation? A) BH_3-THF HC^-, H_2O_2 B) H^-, H_2O C) Hg(OAc)_2, H_2O/THF NaBH_4 D) Hg(O_2CCF_3)_2, CH_3OH 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? CH_3CH_2Br + -OH rightarrow A) CH_3CH_2Br + H + O- B) HOCH_2CH_2Br c) CH_3CH_2OH + 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 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 EI reaction A) I B) II C) III D) IV C) V

Explanation / Answer

(55) To get more stable carbocation we can expect, 1,2 - shift of hydride or methide ion.

(B) It is a secondary carbocation, If methide ion from adjacent carbon atom is transferred it gets stability by forming tertairy carbocation.

(56) (E) Hydroboration followed by hrolysis forms the product which is opposite to anti markovnikoff' rule.

(57) (A) Anti Markovnikoff's product is formed . So, it needs (A)

(58) (E) More substituted alkene with similar atoms at oposide is more stable. Moer i the stability less is the ability to undergo hydrogenation. Hence less heat of hydrogenation is observed.

(59) (D) Fisrt base abstracts a proton follwed by elimination of Bromide ion forms alkene as the product.

(60) (C) Since tertiary butoxide is bulk base, it abstracts proton from less hindered carbon.
(61) (D) IV Forms allylic carbocation which is stabilised by resonance.

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Which of the following carbocations is (are) likely to undergo rearrangement thr

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

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

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