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What is the correct IUPAC name of the compound CH2=CH-CN?

1. Ethenenitrile
2. Vinyl cyanide
3. Cyano ethene
4. Prop-2-enenitrile

Correct answer: Prop-2-enenitrile

Solution

CH2=CH-CN has 3 carbons including the CN carbon. In IUPAC nomenclature, the nitrile carbon (C1) is included in the parent chain. The double bond is at C2-C3 (numbering from CN end). Name: prop-2-enenitrile.

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