Chemistry · Nomenclature (Trivial and IUPAC)

The IUPAC name for the compound is:

The IUPAC name for the compound is:

  • A. trans-3-iodo-4-chloro-3-pentene
  • B. cis-3-chloro-3-iode-2-pentene
  • C. trans-2-chloro-3-iodo-2-pentene
  • D. cis-3-iodo-4-chlore-3-pentene

Step-by-step solution

The compound is a pentene with a double bond. IUPAC rules require the double bond to have the lowest possible number, so it should be 2-pentene, not 3-pentene. Options A and D incorrectly use '3-pentene'. Between B and C, option B has both substituents on the same carbon (C3) with a cis configuration, but option C correctly places substituents on different carbons (C2 and C3) with trans geometry, following alphabetical order (chloro before iodo). Therefore, option C is the correct IUPAC name.
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