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Question

In a SN2 substitution reaction of the type:
R−Br+Cl−DMF−−−→R−Cl+Br− which one of the following has the highest relative rate?

A
CH3CH2CH2Br
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B
CH3CH2Br
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C
(CH3)3CCH2Br
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D
(CH3)2CHCH2Br
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Solution

The correct option is B CH3CH2Br
SN2 mechanism is followed in case of primary and secondary alkyl halides i.e. SN2 reaction is favoured by small groups on the carbon atoms attached to halogen so, CH3X>RCH2X>R2CHX>R3CX. Primary is more reactive than secondary and tertiary alkyl halides.

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