The IUPAC name of HOOC - CH = CH - COOH is:

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But-2-ene-1, 4-dicarboxylic acid

Ethene dioic acid

But-2-ene-1, 4-dioic acid

Ethene dicarboxylic acid

answer is B.

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Detailed Solution

Carboxylic acid	Carboxy(oic acid)	-oic acid -carboxylic acid
Acid anhydride	-	-oic anhydride - carboxylic anhydride
Carboxylic ester	Alkoxycarbonyl	-oate -carboxylate
Amide	Amido	-amide -carboxamide
nitrile	cyano	-nitrile(keep “e”) -carbonitrile
Aldehyde	Oxo	-al -carbaldehyde
Ketone	Oxo	-one
Alcohol	Hydroxy	-ol
Amine	Amino	-amine
Alkene	Enyl	-ene
Alkyne	Ynyl	-yne
Alkyl	Yl	-ane

The order when multi-functional group is present is that we have to follow the following priority order. Remaining rules like long chain rule and least sum rule must also be obeyed.

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