Question

Which one of the following has highest dipole moment?

• A. cis-but-2-ene
• B. trans-1, 2-dichloroethene
• C. cis-1, 2-dichloroethene
• D. trans-but-2-ene

Answer 1

Answer: (C)

(a) cis-but- $2$ -ene



(b) trans- $1,2$ -dichloroethene



(Bond moments cancel out in trans form)

(c) cis - $1,2$ -dichloroethene



Bond moments do not cancel out in cis form)

(d) trans-but- $2$ -ene