In the present investigation, an attempt has been made to evaluate internal pressure (Pi), energy (ΔEvap), and enthalpy of vaporization (ΔHvap) along with excess entropy (SE)  and excess isothermal compressibility (βTE) for binary solutions of alkanones (2-propanone, 2-butanone, and 2-heptanone) and aromatic amines (aniline, N-methylaniline, and pyridine) at 293.15, 298.15, and 303.15 K, respectively. The cohesive energy density (CED) and solubility parameter (δ) are studied to understand the strength of molecular interactions. The coefficient of thermal expansion (α) and isothermal compressibility (βT) have also been investigated using empirical equations and have been employed to understand the molecular interactions. All the evaluated properties have been used to understand the nature and extent of intermolecular interactions taking place. The observed trends in the properties and their variations have been discussed in terms of varying chain lengths of the alkyl group and the hydrogen bonding capability of the components. The findings show that the extent of interactions follows an order: aniline > NMA > pyridine, keeping the alkanone constant at all the temperatures under study.

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A simple, precise, accurate and economic simultaneous UV spectrophotometric method has been developed for the estimation of Paracetamol, Chlorpheniramine Maleate, Phenylephrine Hydrochloride and Caffeine in tablet formulation. The estimation was based upon the measurement of absorbance at absorbance maxima of 245 nm, 260 nm, 269 nm and 275 nm for Paracetamol, Chlorpheniramine Maleate, Phenylephrine Hydrochloride and Caffeine in water, respectively in tablet dosage form. The method was then validated for different parameters as per ICH (International Conference on Harmonization) guidelines.