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How is acetylene prepared by Kolbe's electrolysis?

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Acetylene may be prepared using Kolbes electrolytic method employing potassium fumerate. Acetylene is obtained at anode. The solution is basic due to formation of KOH at cathode.

$$ (CHCOONa)_{2} \xrightarrow[]{Electrolysis} C_{2}H_{2} + 2CO_{2} + 2KOh + H_{2} $$

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