Understanding Isomers and Notation

What is a key characteristic of stereoisomers?

• They have different atomic numbers.

• They are always geometric isomers.

• They have the same spatial arrangement.

• They have the same order of atoms but different spatial arrangements.

Why do double bonds restrict rotation in geometric isomers?

• Because they prevent rotation around the bond.

• Because they allow free rotation.

• Because they are stronger than single bonds.

• Because they are weaker than single bonds.

What defines a trans isomer?

• Functional groups on opposite sides of a single bond.

• Functional groups on the same side of a single bond.

• Functional groups on opposite sides of a double bond.

• Functional groups on the same side of a double bond.

Why might E&Z notation be preferred over cis and trans notation?

• It is only used for alkanes.

• It is used for more complex molecules where cis and trans are insufficient.

• It is used for molecules with single bonds.

• It is simpler to use.

What is the first step in determining E&Z notation?

• Identify the longest carbon chain.

• Assign priorities based on atomic number to groups attached to the double bond.

• Determine the number of hydrogen atoms.

• Identify the presence of single bonds.

Which atom would have higher priority in E&Z notation?

• Oxygen

• Carbon

• Hydrogen

• Fluorine

In E&Z notation, what does 'E' stand for?

• Same side

• Opposite side

• Equal priority

• End of chain

What happens if a double-bonded atom appears in E&Z notation?

• It is ignored.

• Its atomic number is halved.

• It is counted as a single bond.

• Its atomic number is doubled.

How are hydrogens treated in E&Z priority rules?

• They are always considered.

• They are considered only if they are isotopes.

• They are given the highest priority.

• They are negligible unless they are isotopes.

What is the Z isomer in E&Z notation?

• Groups with lower priority are on opposite sides.

• Groups with lower priority are on the same side.

• Groups with higher priority are on opposite sides.

• Groups with higher priority are on the same side.