Which of the following bromides will react faster with CH_3OH in an SnI reaction

Question

Which of the following bromides will react faster with CH_3OH in an SnI reaction? A) Br_CH_3 CH_2CHCH_3 B) CH_3CH_2CH_2Br C) CH_2 = CHCH_2CH_2Br D) (CH_3)_2CBrCH_2CH_3 E) CH_3Br The S_N2 mechanism for nucleophilic substitution reactions A) involves two steps and occurs with inversion of configuration. B) involves one step and occurs with inversion of configuration. C) involves two steps and occurs with racemization. D) involves one step and occurs with retention of configuration. E) involves one step and occurs with racemization.

Explanation / Answer

56)
SN1 will be fastest if -Br is attached to tertiary carbon because this will form tertiary carbocation as product which is most stable carbocation
Answer: D

57)
SN2 reaction proceed in 1 step and there is always inversion of configuration
Answer: B

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