Question

Arrange the following compounds in order of increasing dipole moment. (I) Toluene (II) m - dichlorobenzene (III) o - dichlorobenzene (IV) p - dichlorobenzene

• A. I < IV < II < III
• B. IV < I < II < III
• C. IV < I < III < II
• D. IV < II < I < III

Answer 1

The correct option is B

IV < I < II < III

Resultant dipole moment may be calculated using vectorial method.

$\mu =\sqrt{{\mu }_2{}^2+{\mu }_2{}^2+2{\mu }_2{\mu }_2\cos \theta }$