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  4. X is heated with soda lime and gives ethane. X is :

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Q. $X$ is heated with soda lime and gives ethane. $X$ is :

AFMCAFMC 2005Aldehydes Ketones and Carboxylic Acids

Solution:

Sodium salt of any carboxylic acid with hot soda lime undergo decarboxylation to form alkane which has one carbon atom less than the parent molecule.
$\underset{\text{Propanoic acid}}{C _{2} H _{5} COOH} \xrightarrow[\Delta]{ NaOH / CaO} C _{2} H _{6} \uparrow+ Na _{2} CO _{3}$