question_answer

When propionic acid is treated with aqueous sodium bicarbonate, \[C{{O}_{2}}\]is liberated. The C from \[C{{O}_{2}}\]comes from.

A)  methyl group         

B)  carboxylic acid group

C)  methylene group      

D)  bicarbonate

Correct Answer: D

Solution :

Carboxylic acids reacts with weaker bases such as bicarbonates producing \[C{{O}_{2}}.\] The \[C{{O}_{2}}\] evolved comes from \[NaHC{{O}_{3}},\] not from carboxylic group as shown below.