IUPAC name of ${C H}_{2} = C H - C N$ is:

Ethenenitrile

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Vinyl cyanide

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Cyano ethene

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Prop-2-ene-nitrile

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Solution

The correct option is D Prop-2-ene-nitrile
The IUPAC name of the given compound is Prop-2-ene-nitrile. It contains 3 carbon atoms, hence the prefix is prop-, and the -ene postfix is due to the double bond. It is nitrile, since it contains the nitrile functional group, i.e., $(R - C \equiv N)$ .

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