An incorrect statement with respect to SN1 and SN2 mechanism for alkyl halide is :
A
competing reaction for an SN2 reaction is rearrangement
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B
a weak nucleophile and a protic solvent increases the rate or favours SN1 reaction
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C
a strong nucleophile in an aprotic solvent increases the rate or favours SN2 reaction
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D
SN1 reactions can be catalysed by some Lewis acids
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Solution
The correct option is A competing reaction for an SN2 reaction is rearrangement SN2 reaction does not involve rearrangement as it is a concerted one step reaction. However, SN1 undergoes rearrangement reaction.