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6-Chloro-3-hydroxy-2-{(E)-1′-methyl-2′-phenylvinyl}-4-oxo-4H-1-benzopyran (CHMPB) solution in ethanol forms a yellow coloured (1:1) complex with tin(II) in hydrochloric acid medium which is extractable into dichloromethane after equilibration. During study on this complex, it is found to be quite stable, obeying Beer’s law. Interaction is studied with various ions and molar absorptivity, Sandell’s sensitivity, standard deviation, regression coefficient, linear regression equation and detection limit are also investigated. Job’s method and mole ratio method are used to study stoichiometry of the complex. The method is simpler, more accurate, sensitive, rapid and selective as compared to existing methods and is applicable to analysis of various synthetic samples of varied composition and industrial sample like gun metal