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

(27) The SN2 mechanism is concerted reaction mechanism. In this process the attacking nucleophile froms the bond and leaving nucleophile braks the bond simultaneously. Hence, less is the hindrance aound carbon fast is the reaction. Hence,

(d) CH3Br

(28)

(B) NaOC(CH3)3, a tertiary butoxide works best for E2 elimination reactions.

(29)

(B)

The order reactivity of alkyl halides in SN2 mecahnism is,

primary > secondary > tertiary

(30)

(A) HBr followed by NaCN

(31) (A)

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