Which of the following reacts the fastest by the S_N2 mechanism? A) CH_3CH_2Br D

Question

Which of the following reacts the fastest by the S_N2 mechanism? A) CH_3CH_2Br D) (CH_3)_2CHBr C) (CH_3)_3CBr D) CH_2Br Which of the following bases works best to maximize the E2 product in the reaction shown below? (CH_3)_2CHCH_2CH_2CH_2Br + base rightarrow (CH_3)_2CHCH_2CH=C_2 A) NaOH B) NaOC(CH_3)_3 C) KOCH_2CH_3 D) NaOCH_2CH_3 Which of the following does not correctly describe S_N2 reactions of alkyl halides? A) The mechanism consists of a single step with no intermediates. B) Tertiary halides react faster than secondary halides. C) The transition state species has a pentavalent carbon atom. D) Rate of reaction depends on the concentrations of both the alkyl halide the nucleophile. Starting 1-hexene [CH_2CH(CH_2)_3CH_3] which synthetic sequence below gives 2-cyanohexane [CH_3CHCN(CH_2)_3CH_3]? A) (1) HBr (2) NaCN B) (1) H_2SO_4 (cat). H_2O (2) NaCN C) (1) Br_2 H_2O (2) NaCN D) (1) HBr/peroxide (2) NaCN What is the major product in the following react

Explanation / Answer

Q27.

The SN2 favours the primary cabrons the most

therefore, primary carbons present will have the highest rate of reaction

from the list

CH3-Br is the best option, so for a SN2, in which a substitution is made in ONE single step

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