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

$(a)\;I < IV < II < III \\ (b)\;IV < I < II < III \\ (c)\;IV < I < III < II \\ (d)\;IV < II < I < III$

The dipole moment of p-dichlorbenzene is zero as the dipole moment due to the two cl atom o- and m-dichlorobenzene have higher dipole moment than toluene.
Again o-dichlorbenzene has higher dipole moment than m-dichlorobenzene.
Hence the increasing order is p-dichlorbenzene < toluene < m- dichlorbenzene
Hence b is the correct answer