Question

The incorrect statement regarding the geometrical isomers of 2-butene is:

• A. cis-2-butene and trans-2-butene are not interconvertible at room temperature.
• B. cis-2-butene has less dipole moment than trans-2-butene.
• C. trans-2-butene is more stable than cis-2-butene.
• D. cis-2-butene and trans-2-butene are stereoisomers.

Answer 1

The Correct Option is B

The molecular structures of cis-2-butene and trans-2-butene are presented below:

cis-2-butene: \( \text{CH}_3 - \text{CH} = \text{CH} - \text{CH}_3 \) (Polar)
trans-2-butene: \( \text{H} - \text{CH} = \text{CH} - \text{CH}_3 \) (Non-Polar)

Cis-but-2-ene exhibits a greater dipole moment compared to trans-but-2-ene owing to the spatial orientation of its substituent groups. The cis arrangement leads to a resultant dipole moment, whereas the symmetrical trans arrangement causes the dipoles to cancel.