Question

How many minimum no.of C-atoms are required for position & geometrical isomerism in alkene?

• A. 4,3
• B. 4,4
• C. 3,4
• D. 3,3

Answer 1

The correct option is B 4,4

The smallest alkene showing geometrical isomerism is $but-2-ene$ ($4-C$ atoms)

The smallest alkene showing position isomerism is butene ($4-C$ atoms), where the position of double bonds may vary.

Hence, answer is $4,4$