Question

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

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 ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_2-\mathrm{Br}$:

Step1: 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 $4$ carbon atoms, hence the root word will be “But” and the functional groups are Bromide and a double bond.

Step 2: Giving the lowest numbering to the locant and identifying functional groups

• The functional group is a halogen thus the prefix halo- should be used and the lowest numbering here $1$should be given.
• The prefix for bromide will be Bromo and thus the naming will be $1$ Bromo and for the double bond will be $2$- ene.

Step 3: Adding prefix and suffix:

• Locant + Prefix + root + locant + suffix.
• Thus the name of the compound will be $1-\mathrm{Bromo}-\mathrm{but}-2-\mathrm{ene}$