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 satl of pentanoic acid gives butane.
`C_(4)H_(9)COONa+NaOHoverset(CaO)rarrC_(4)H_(10)+Na_(2)CO_(3)`

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