The elimination mechanism requires a specific spatial orientation between the departing leaving group and the abstracted -hydrogen. This geometry must be:

Question

The $E2$ elimination mechanism requires a specific spatial orientation between the departing leaving group and the abstracted $\beta$ -hydrogen. This geometry must be:

Prashant Kotian · Accepted Answer

Correct answer: B. For the -bond to form efficiently as the and bonds break in a single concerted step, the orbitals must be parallel. The anti-coplanar geometry minimizes steric repulsions during the transition state.

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