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Sodium salt of which fatty acid is neede...

Sodium salt of which fatty acid is needed to prepare butane ? Give the equation.

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Pentanoic acid has five carbon atoms. On decarboxylation, sodium salt of pentanoic acid gives butane.
`C_(4)H_(9)COONa+NaOH overset(CaO)rarr C_(4)H_(10)+Na_(2)CO_(3)`
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