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Question

Write the IUPAC name of CH2CH=CH-CH2-Br


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Solution

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 CH3CH=CH-CH2-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 1should 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-Bromo-but-2-ene

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