Question

Dipole moment of $\left(1\right)$ $p$-dinitrobenzene $\left(2\right)$ $p$-dichlorobenzene and $\left(3\right)$ $p$-dimethoybenzene are in the order:

• A. $3>2>1$
• B. $3=2>1$
• C. $3=2=1$
• D. $3>(2=1)$

Answer 1

Answer: (D)

$3>(2=1)$

1.p-dinitrobenzene

(Image 1)

${\mu }_{net}=0$

2.p-dichloro benzene

(Image 2)

${\mu }_{net}=0$

3.p-dimethoxybenzene

(Image 3)

${\mu }_{net}=0$ (For first structure)

${\mu }_{net}\ne 0$ (For second structure)

${\mu }_{average}\ne 0$

$\therefore$ Order of dipole moment

$3>(2=1)$