The IUPAC name of carboxylic acid with three carbon atoms is:

ethanoic acid

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acetic acid

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propanoic acid

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propionic acid

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Solution

The correct option is A propanoic acid
According to $I U P A C$ convention, acid group is given highest priority than saturated carbons. So the name would be propanoic acid since the number of carbons atom is three, a prefix is $(p r o p a n -)$

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