Question

action of heat on a mixture of sodium propionate and soda lime produces

Answer 1

The gas evolved is ethane. ... C(2)H(5)COONa + NaOH ------> C(2)H(6) + Na(2)CO(3). This reaction proceeds with the application of heat; this type of reaction in which CO(2) molecule is removed from a carboxylic acid is called decarboxylation.

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Answer 2

sodium propionate on reaction with soda-lime (CaO) give an alkane with one carbon less than the acid.
[Called decarboxylation reaction]

So sodium propanoate on decarboxylation will give ethane and sodium carbonate.

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