Ethyltrimethylammonium hydroxide, [CH3CH2N(CH3)3]^+ OH^-, is heated strongly (Hofmann elimination). The hydrocarbon formed is

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Ethyltrimethylammonium hydroxide, $[CH X_{3} CH X_{2} N (CH X_{3}) X_{3}] X^{+} OH X^{-}$ , is heated strongly (Hofmann elimination). The hydrocarbon formed is

Hydroxide removes a beta hydrogen from the ethyl group while the trimethylamine group leaves in a single E2 step. The products are

CH X_{2} = CH X_{2}

N (CH X_{3}) X_{3}

and

H X_{2} O

, so the hydrocarbon is ethene.