2. Identifying Cis or Trans Isomers

Consider a compound with 4 different groups attached to the C = C bond

  • Consider each of the double bonds separately.
  • Identify the two atoms directly attached to each carbon in the double bond
  • If the two atoms with larger atomic numbers are on the same side:
    • It is a cis isomer.
  • If the two atoms with larger atomic numbers are on opposite sides:
    • It is a trans isomer.

Note: Show clear trigonal planar shape around the 2C atoms of C=C bond

01 Multiple Choice