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CGP EDU Academic Team
Published on: August 14, 2026
Experimental evidence indicates that the five atoms involved in the transition state of E 2 elimination must lie in the same plane. The requirement for coplanarity arises from a need for proper overlap of orbitals in the developing n bond of the alkene that is being formed. There are two ways that this can happen anticoplanar and syn coplanar and anticoplanar conformation is the prepared one because it is staggered.
(i) The major product in the following reaction :-
?
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CHECK THE SOLUTION.
(i)
Sol. 
(ii)
Sol. Trans-2-butene
(iii)
Sol. 
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