Original Article http://www.bpasjournals.com/chemistry Bulletin of Pure and Applied Sciences. Vol.39 C (Chemistry), No.1, 2020: P.32-37 Print version ISSN 0970 4620 Online version ISSN 2320 320X DOI 10.5958/2320-320X.2020.00004.7 Excess Molar Volumes of Binary Liquid Mixtures of Cyclohexanone + Dichloromethane, + Trichloromethane, + 1,1,1-Trichloroethane and 1,2 Dichloroethane at 308.15 K Abstract Excess molar volumes, Vm E , at T 308.15 K have been measured for binary liquid mixtures of cyclohexanone (C6H10O) + dichloromethane (CH2Cl2), + trichloromethane (CHCl3), + 1,1,1trichloroethane (CCl3CH3), and + l,2- dichloroethane (CH2ClCH2Cl). The values of Vm E have been fitted in appropriate equations using a least-squares method. Vm E has been found to be negative throughout the entire range of composition for mixtures of C6H10O + CH2Cl2, + CHCl3, and + CCl3CH3. For C6H10O + CH2ClCH2Cl, Vm E has been found to be positive at lower mole fractions of C6H10O, and negative at higher mole fractions. These results indicate presence of specific interactions between these components. Keywords: Excess molar volumes; Cyclohexanone; Trichloromethane. Varun Kumar Singh 1 Atri D.Tripathi 2 * Pallavi Yadav 3 Nishi Chahal 4 Anshika Sehgal 5 Author Affiliations 1,2,3,4,5 Dept. of Chemistry, Faculty of Engineering, Teerthanker Mahaveer University, Moradabad, Uttar Pradesh 244001, India. *Corresponding Author Atri D. Tripathi, Dept. of Chemistry, Faculty of Engineering, Teerthanker Mahaveer University, Moradabad, Uttar Pradesh 244001, India. E- mail: atri34tmu@gmail.com Received on 18.02.2020 Accepted on 23.03.2020 1. INTRODUCTION Binary mixtures of cyclohexanone (C6H10O) with dichloromethane (CH2Cl2)), trichloromethane (CHCl3), 1,1,1-trichloroethane (CCl3CH3), and 1,2 dichloroethane (CH2ClCH2Cl) are of particular interest from the viewpoint of electron donor-acceptor interaction leading to the formation of intermolecular adducts between the components in the liquid state. A binary mixture is formed by the replacements of like contacts by unlike contacts in the mixture. The specific interaction of C6H10O with the above chloro-compounds can be visualized as being due to the presence of lone- pair electrons on the oxygen atom of C6H10O, which can make this species act as an n-donor toward these chloro-compounds. On the other hand, CH2Cl2, CHCl3, CCl3CH3, and CH2ClCH2Cl, can be involved in the formation of H-bond with, and act as σ-acceptors toward, C6H10O. These experimental data are very useful to the development of new thermodynamic property predictive methods and for verifying the existing theories of liquids. Literature survey revealed that measurements on [1-5] excess molar volumes, Vm E , speeds of sound, u, relative permittivities, εr, and refractive indexes, nD, for mixtures of acetone (CH3COCH3) or methylethyl ketone (CH3COC2H5) with CH2Cl2, CH2ClCH2Cl, CHClCCl2, and CCl2CCl2 are available. Extensive studies concerning interactions between the components of mixtures of chloroalkanes with ketones of more complexity have not been made. Therefore, the study of excess thermodynamic properties, such as excess molar volume, is quite important to understand molecular interactions in mixtures and to develop and test theories of solutions and mathematical models. Hence, in this work, we have measured Vm E of C6H10O + CH2Cl2, + CHCl3, + CCl3CH3, and + CH2ClCH2Cl and the results of these measurements are reported and interpreted here.