Dat Genius organic error?

[thegreat267]

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I know for E2 it has to be transdiaxial for it to occur. Is it an error on there part?

Thanks

 

[FeralisExtremum]

The leaving group (Cl) and the Hydrogen being removed from the adjacent (more substituted) carbon are anti-coplanar so it works out just fine. A is the correct answer.

 

[thegreat267]

You're right. You're right.. My mistake. It is transdiaxial.