Molar excess volume of sec- and tert-butyl chloride with aromatic hydrocarbons at T=298.15 K

The molar excess volumes (V-E) of sec-butyl chloride or tert-butyl chloride (A) + benzene or toluene or o- or m- or p-xylene (B) were measured at T = 298.15 K over the entire composition range using a V-shaped dilatometer. The V-E values for all these binary mixtures were found to be negative, whereas these change sign from positive to negative for sec-butyl chloride + benzene. Although the V-E values for an equimolar mixture of sec-butyl chloride + aromatics vary in the order benzene > m-xylene > toluene > p-xylene > o-xylene, for an equimolar mixture of tert-butyl chloride + aromatics, these follow the sequence benzene > m-xylene > p-xylene > toluene > o-xylene. Branching of the butyl group decreases the V-E in the following order: n-butyl chloride > sec-butyl chloride > tert-butyl chloride.