The IUPAC name of
is :

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Ethane-1, 2-dicarbonitrile

Butane-1,4-dinitrile

Butane-1, 4-dicarbonitrile

Ethane-1, 2-dinitrile

answer is D.

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Detailed Solution

Carboxylic acid	Carboxy	-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. Here the principle functional group is nitrile.

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