When sodium salt of carboxylic acid is heated with soda lime then we get a less carbon alkane. The reaction is called decarboxylation.
RCOONa+NaOH CaO,∆-> RH + Na2CO3
There is only one sodium salt to obtaine neopentane via carboxylarion:
The reaction is:
CH3C(CH3)CH2COONa + NaOH -> C(CH3)4 + Na2CO3