Summary The dipole moments of cyclopropyl chloride and 1, l-dichlorocyclopropane in benzene solution have been shown to be about 0. 3~ less than the corresponding cyclopentyl compounds. This has been interpreted as indicating a small contribution from ionic resonance structures analogous to the principal ionic resonance structures in vinyl chloride and chlorobenzene. The dipole moments of the cyclopentyl halides and cyanide ...