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The elimination reactions mainly involve three mechanism E1,E2 and E1cB. If the leaving group departs before `beta`-proton (`H^t=Theta` ion) then it is E1 mechanism. If proton is taken off first before leaving group it is E1cB mechanism.The pure E2 involves both `beta`-Hydrogen and leaving group departing simutaneously. If acidity of `beta`-Hydrogen increases and leaving group ability decreases then E1cB mechanism increases.
Which of the following substrate will undergo fastest reaction through E1cB route
A. image
B. image
C. image
D. image

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1 Answer

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Correct Answer - D
`-I` and -M group increases acidic strength.

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