Question

Predict the order of reactivity of the following compounds in SN1 and SN2 reactions
allyl chloride, vinyl chloride and benzyl chloride.

Answer 1

Answer:

benzyl chloride>allyl choride>vinyl chloride in SN1 reaction  

allyl chloride> benzyl chloride> vinyl chloride in SN2  reaction

Explanation:

In SN1 reactions, the stability of carbocation formed is to be considered so here benzyl carbocation is more stable than allyl carbocation because the no of resonance structures is more for the former.

In SN2 reactions, steric hinderance and polarisation of carbon is taken into consideration. In sn2 reactions primary alkyl halides are more reactive than vinyl chlorides