Page 9 Flashcards
What causes the formation of stereoisomers in alkenes?
A: Restricted rotation around the double bond allows for the formation of distinct spatial arrangements, leading to stereoisomers.
What are the two stereoisomers of 2-butene?
A: Cis-2-butene and trans-2-butene.
What is the key difference between cis- and trans-isomers of alkenes?
A: In cis-isomers, the substituents on the double bond are on the same side, whereas in trans-isomers, they are on opposite sides.
How are cis-2-butene and trans-2-butene classified in stereoisomerism?
A: They are diastereomers, meaning they are stereoisomers that are not mirror images of each other.
Why can’t cis- and trans-isomers interconvert easily?
A: The π bond in the double bond restricts rotation, preventing interconversion without breaking the bond.
Which type of stereoisomerism is exhibited by alkenes like 2-butene?
A: Geometric isomerism (a subset of diastereomerism).
Which type of stereoisomerism is exhibited by alkenes like 2-butene?
A: Geometric isomerism (a subset of diastereomerism).
Which type of stereoisomerism is exhibited by alkenes like 2-butene?
A: Geometric isomerism (a subset of diastereomerism).
What determines whether an alkene can exhibit cis-trans isomerism?
A: The presence of two different groups attached to each carbon of the double bond.
What determines whether an alkene can exhibit cis-trans isomerism?
A: The presence of two different groups attached to each carbon of the double bond.
What is the relationship between cis-trans isomerism and molecular polarity?
A: Cis-isomers are generally more polar than trans-isomers due to their substituent arrangement on the same side of the molecule.
Which stereoisomer of 2-butene has a higher boiling point, cis- or trans-?
A: Cis-2-butene has a higher boiling point due to its polarity.
Can all alkenes exhibit stereoisomerism?
A: No, only alkenes with two different substituents on each carbon of the double bond can exhibit cis-trans isomerism.
