Question

Write the IUPAC name of ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CN}$

Answer 1

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 groups

• The 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 it

Step 3: Adding prefix and suffixes:

• Locant + Prefix + Root + Locant + Suffix
• 
• Thus, the name will be.$\mathrm{Prop}-2-\mathrm{ene}-1-\mathrm{nitrile}.$