Exams › JEE Main › Chemistry

Which of the following alkenes can show geometrical isomerism?

1. 2-Phenyl-1-butene
2. 1,1-Diphenyl-1-propene
3. 1-Phenyl-2-butene
4. 3-Phenyl-1-butene

Correct answer: 1-Phenyl-2-butene

Solution

Geometrical isomerism needs each double-bond carbon to carry two different groups. 1-Phenyl-2-butene (Ph-CH2-CH=CH-CH3) has H plus a different group on each sp2 carbon -> shows cis/trans. The others have a terminal =CH2 or two identical groups (=CPh2), so no geometrical isomerism.

Related JEE Main Chemistry questions

• Lactic acid loses its optical activity when the hydroxyl group is replaced by hydrogen because
• Which is the most suitable technique for separating a mixture of sugars?
• Which statement correctly compares the staggered and eclipsed conformations of ethane?
• Which statement correctly describes a common feature shared by optical and geometrical isomerism?
• Which substituent lowers the reactivity of a benzene ring toward electrophilic substitution, yet still mainly directs a new group to the ortho and para positions?
• Among the following substances, which has the greatest affinity for a proton?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →