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Q. n-propyl bromide on treatment with ethanolic potassium hydroxide produces

IIT JEEIIT JEE 1987Haloalkanes and Haloarenes

Solution:

An alkyl halide containing at least one $\beta-H$, on treatment with ethanolic $KOH$, undergoes dehydrohalogenation, giving alkene.
$CH_3 -CH_2-CH_2 -Br+KOH \, \xrightarrow{\text{Ethanol}} CH_3-CH =CH_2$