E/Z Absolute Configuration of Alkenes

The video tutorial explains the E&Z terminology for alkenes, highlighting the limitations of cis and trans terms for tri- or tetra-substituted alkenes. It introduces the Con Ingold Prelog convention to assign priority to substituents on each carbon of a double bond, allowing for the determination of E (opposite sides) or Z (same side) configurations. The tutorial provides examples to illustrate the process and offers a mnemonic to remember the E&Z meanings.

Why is the cis-trans terminology insufficient for tri- and tetra-substituted alkenes?

• It becomes ambiguous without a clear reference point.

• It does not account for the number of substituents.

• It is too complex to understand.

• It is not recognized internationally.

What do the German terms 'int gagan' and 'zusamen' refer to in E&Z nomenclature?

• The number of substituents.

• The position of the highest priority groups.

• The type of chemical bond.

• The size of the alkene groups.

What is the primary factor used in the Cahn-Ingold-Prelog convention to assign priority?

• The atomic number of the atoms.

• The size of the molecule.

• The color of the compound.

• The number of bonds.

How do you determine the priority of substituents on an alkene using the Cahn-Ingold-Prelog convention?

• By counting the number of atoms in each substituent.

• By comparing the atomic mass of the first atom in each substituent.

• By comparing the size of the substituents.

• By measuring the length of the substituent chains.

What does it mean if the highest priority groups are on opposite sides of the double bond?

• The alkene is classified as Z.

• The alkene is classified as E.

• The alkene is classified as cis.

• The alkene is classified as trans.

In the Cahn-Ingold-Prelog convention, what should you do if there is a tie in priority?

• Continue to the next atom until a difference is found.

• Choose the group with the heaviest atom.

• Choose the group with the lightest atom.

• Choose the group with the most atoms.

What mnemonic can help you remember the meaning of Z in E&Z nomenclature?

• Z means zero.

• Z means opposite side.

• Z means same side.

• Z means zigzag.