Question

The molecules that have non-zero dipole moment, are
(1) trans-$2$-butene
(2) trans-$2$-pentene
(3) $2,2,3,3$-tetramethyl butane
(4) cis-$3$-hexene

• A. 1, 2 and 3 are correct
• B. 1 and 2 are correct
• C. 2 and 4 are correct
• D. 1 and 3 are correct

Answer 1

Answer: (C)

Dipole moment is zero for symmetrical molecule. Tran $5-2$-pentene and cis-$3$-hexene, being unsymmetric, have some dipole moment.