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# Write the IUPAC name of ${\mathrm{CH}}_{2}=\mathrm{CH}-\mathrm{CN}$

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## IUPAC:IUPAC is the abbreviation for International Union of Pure and Applied Chemistry.IUPAC is the system of nomenclature used to name the chemical compounds.IUPAC name of ${\mathrm{CH}}_{2}=\mathrm{CH}-\mathrm{CN}$:Step 1: Determination of the root word.Select the continuous chain with the maximum number of carbon atoms containing the functional group such that the functional group gets the lowest possible number.Here the chain has $3$ carbon atoms, hence the root word will be “Prop”. Step 2: Identifying the name and position of locants and functional groupsThe given organic compound is polyfunctional thus one of the functional groups should be made the principal functional group The principal functional group is chosen as per the decreasing order of priority given for some functional groups.The decreasing order of priority is:$-\mathrm{COOH},-{\mathrm{SO}}_{3}\mathrm{H},-\mathrm{COOR},\mathrm{COCl},-{\mathrm{CONH}}_{2},-\mathrm{CN},-\mathrm{HC}=\mathrm{O},>\mathrm{C}=\mathrm{O},-\mathrm{OH},>\mathrm{C}=\mathrm{C}<,-\mathrm{C}\equiv \mathrm{C}-$As per the given organic compound, there is a nitrile group and a double group present thus as per the decreasing order of priority $-\mathrm{CN}>\mathrm{C}=\mathrm{C}$, thus nitrile group is the primary functional group, and thus lowest numbering is $1$ is given to itStep 3: Adding prefix and suffixes:Locant + Prefix + Root + Locant + SuffixThus, the name will be.$\mathrm{Prop}-2-\mathrm{ene}-1-\mathrm{nitrile}.$

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