Which of the following alkenes shows cis-trans isomerism?
Alkenes with different groups attached to the doubly bonded carbon atoms exhibit cis-trans isomerism. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.