Question Detail
Question
In the molecule 2-butene, the two methyl groups are on opposite sides of the double bond. This isomer is classified as:
Correct Answer
Option D is the correct answer.
Detailed Explanation
The correct answer is D. trans-isomer.
In the context of geometric isomerism for alkenes, the prefix trans- (from Latin, meaning "across") is used when the identical groups—in this case, the two methyl ($-CH_3$) groups—are on opposite sides of the double bond.
Hint
Use Cahn-Ingold-Prelog priority rules to assign E/Z configuration.