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Sodium salt of which acid will be needed...

Sodium salt of which acid will be needed for the the preparation of butane? Write chemical equation for the reaction.

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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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