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MCQ
In the E2 elimination mechanism, what is the required relationship between the leaving group and the beta-hydrogen?
Chemistry
A They must be gauche
B They must be anti-periplanar (180 degrees dihedral angle)
C They must be syn-periplanar (0 degrees dihedral angle)
D There is no geometric requirement
Explanation

E2 requires an anti-periplanar arrangement where the C-H and C-LG bonds are at 180 degrees, allowing maximum orbital overlap for the developing pi bond.

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