Question

for benzyl bromide would you expect your observations to change if E1/E2 reaction occurred instead of SN1 briefly explain how and why​

Answer 1

inversion occurs in sn1 reaction

The Winstein model fits with what is commonly taught, namely that SN1 gives racemisation and SN2 gives inversion: ... SN1 reactions occur when the nucleophile intercepts the fully dissociated free carbocation and gives complete racemisation as both faces of the planar carbocation are equally accessible.

difference between e1 and e2 reactions

Mechanistically, E2 reactions are concerted (and occur faster), whereas E1 reactions are stepwise (and occur slower and at a higher energy cost, generally). Due to E1's mechanistic behavior, carbocation rearrangements can occur in the intermediate, such that the positive charge is relocated on the most stable carbon.

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Answer 2

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SN1 and E1 — the leaving group leaves first. SN2 and E2 — the leaving group leaves last. SN1 and SN2 — the X:⁻ attacks a carbon atom. E1 and E2 — the X:⁻ attacks a β hydrogen atom.

Mechanistically, E2 reactions are concerted (and occur faster), whereas E1 reactions are stepwise (and occur slower and at a higher energy cost, generally). Due to E1's mechanistic behavior, carbocation rearrangements can occur in the intermediate, such that the positive charge is relocated on the most stable carbon.