Consider the follwing reaction

Which of the following bases will give the best yield of alkene (II) as the major product ?

Options

A. `(CH_(3))_(3)CO^(-)`
B. `C_(2)H_(5)O^(-)`
C. `CH_(3)O^(-)`
D. `(C_(2)H_(5))_(3)CO^(-)`

Answer

D

Explanation

The bulkiness of `(C_(2)H_(5))_(3)CO^(-)` makes it more difficult for the more hindered `2^(@)H` to be abstracted, slwing the rate of formation of (I) and favoring the formation of (II) by the removal of the less hindered `1^(@)H`.