Question

Which of the following order is/are correct regarding boiling point?

• A.
• B.
• C.
• D.

Answer 1

Answer: (A), (B), (C), (D)

$\text{Boiling point}\propto \text{dipole moment}$
Greater the dipole moment, greater is the polarity and hence higher will be the boiling point.
(a) Dipole moment of tran-2-butene is zero. Hence it has lower boiling point than cis isomer.


(b) In this case, dipole moment of trans isomer is greater than cis isomer.

(c) p-Dichlorobenzene has zero dipole moment.

(d) p-Chlorotoluene has greater dipole moment than o-chlorotoluene.