Which stereoisomer ― cis− or trans−1−bromo−3−tert−butylcyclohexa ne ― will react faster in an e2 elimination reaction? select the single best answer.

The cis molecule will react faster.

Explanation:

In the E2 mechanism, we have to have an anti-peri-planar configuration. The hydrogen that is removed and the leaving group should have a configuration of 90º in an anti position (see the figure red hydrogens).

In the trans configuration the ter-butyl group would exercise a steric hindrance upon the hydrogens that can be removed. In the cis configuration we don't have this problem. Therefore the cis molecule would react faster.

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