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Published on: August 14, 2026
The elimination reactions mainly involve three mechanism E1, E2, E1cB. If the leaving group departs before β -proton (H ⊕ ion) then it is E1 mechanism. If proton is taken off first before leaving group it is E1cB mechanism. The pure E2 involves both β -Hydrogen and leaving group departing simutaneously. If acidity of β -Hydrogen increases and leaving group ability decreases then E1cB mechanism increases.
(i) 
P (major)
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CHECK THE SOLUTION.
(i) 
(ii) 
CH 2 =CH 2
(iii) –I and –M group increases acidic strength.
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