Question

Match the reactions of column I with the reaction mechanisms of column II:

Answer 1

(A)

E1 cb

Elimination Unimolecular conjugate base

In the first step, $O{H}^{⊝}$ abstracts a proton and forms a carbonions. In the second step, the negative charge on carbon forms a double bond displacing bromide ion.

(B)

$S{N}_2$ substitution nucleophilic bimolecular.

It takes via the formation of transition state and results in an inverted configuration.

$Ph{S}^{⊝}$ attacks from the backside to overcome the elctron repulsion between $B{r}^{⊝}$ and $Ph{S}^{⊝}$.

C)

1) Formation of carbocation.

2) Attack of nucleophile.

D)

1) Formation of carbocation.

2) Attack of alkene.