How are alkenes prepared by Kolbes electrolytic process?
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phenol reacts with sodium hydroxide to give sodium phenxide . sodium phenxide under goes electrophilic substitution reaction with carbon dioxide because phenoxide ion is more reactive than phenol salicylic acid is formed as major product
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The electrolysis of salts of Carboxylic acids which finally produces alkanes is called Kolbe de-Carboxylation reaction.
During this reaction Carbon dioxide is released at anode along with formation of alkanes.
2R-COONa (on Electrolysis) → R - R + 2CO2 + H2 + NaOH
Example: Sodium acetate on electrolysis produces ethane.
2CH3COONa → CH3 - CH3 + 2CO2 + H2 + NaOH

Mechanism:

During this reaction Carbon dioxide is released at anode along with formation of alkanes.
2R-COONa (on Electrolysis) → R - R + 2CO2 + H2 + NaOH
Example: Sodium acetate on electrolysis produces ethane.
2CH3COONa → CH3 - CH3 + 2CO2 + H2 + NaOH

Mechanism:

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