E/Z Isomers

• What is the main objective of studying E/Z isomerism?

  To understand E/Z isomerism
• What type of isomerism is E/Z isomerism classified as?

  It is a type of stereoisomerism
• What do stereoisomers have in common?

  Same structural formula
• What is the significance of C=C double bonds in E/Z isomerism?

  They restrict rotation and create isomers
• What is the arrangement of atoms in a C=C double bond?

  They are planar and trigonal planar
• What is the bond angle in a planar unit of a C=C double bond?

  120°
• What happens to rotation around a C=C double bond?

  Rotation is restricted compared to single bonds
• What is the difference between E-isomer and Z-isomer?

  E-isomer has groups across the double bond
• How are the E and Z isomers defined in but-2-ene?

  E-isomer has CH₃ groups across the double bond
• What do the Cahn-Ingold-Prelog priority rules help determine?

  They help identify E and Z isomers
• What is the first step in applying the Cahn-Ingold-Prelog rules?

  Assign priority to atoms attached to double bond
• How is priority determined if atoms directly bonded are the same?

  Look at the next atom in the groups
• How do you determine if you have an E or Z isomer?

  Check the arrangement of the highest priority groups
• What is the significance of atomic numbers in determining priority?

  Higher atomic numbers indicate higher priority
• What is the structure of the E-isomer in 1-bromo-1-chloro-2-fluoro-ethene?

  Br and F are across the double bond
• What is the structure of the Z-isomer in 1-bromo-1-chloro-2-methylbut-1-ene?

  Both higher priority groups are below the double bond