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Nucleophillic Substitution - Need help

how many different alkenes can be formed when 2-bromo-2 methylbutane reacts with ethanolic potassium hydroxide?
the answer is 2 but I can see it forming 3 because of the oh- ion reacitng with one of the hydrogen at the top methyl group attached to the second carbon on main carbon chain.
Haloalkane to alkene is actually elimination
The third isomer that you seem to be describing is actually exactly the same as one of the other two - it's just drawn in a different way. Try redrawing the 'third' isomer, including that methyl group as part of the linear chain and you'll see that it's the same.

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