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When a concentrated aqueous solution of ...

When a concentrated aqueous solution of sodium formate is used in Kolbe's electrolysis method, no alkane is obtained-why ?

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In Kolbe's electrolysis method, two -R groups of two RCOONa molecules combine to form the alkane , R-R and two `CO_2` molecules are obtained from two `-COONa` groups. As, there is no alkyl group in the salt, sodium formate (HCOONa) no alkane is formed on electrolysis of its concentrated aqueous solution.
`2HCOONa+2H_2Ooverset("Pt-electrodes")underset(["electrolysis"])to2H_2+2CO_2+2KOH`
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