Question

What is the use of the alcoholic solution of $\mathrm{KOH}$?

Answer 1

Alcoholic solution of $\mathrm{KOH}$

• Alcoholic solution of $\mathrm{KOH}$ is used for the dehydrohalogenation of haloalkane.
• Alcoholic $\mathrm{KOH}$ abstract proton from $\beta$carbon of alkyl halide and favors elimination reaction.

Chemical reaction

• The reaction is as follows:-

$$\begin{gathered} \mathrm{H}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Br}+\mathrm{KOH}\left(\mathrm{Alcoholic}\right)\to {\mathrm{CH}}_2={\mathrm{CH}}_2+\mathrm{KBr}+{\mathrm{H}}_2\mathrm{O} \\ \mathrm{\beta }\mathrm{\alpha } \\ \mathrm{Bromoethane}\mathrm{Potassium}\mathrm{hydroxide}\mathrm{Ethene}\mathrm{Potassium}\mathrm{bromide} \end{gathered}$$