One new mesogenic homologous series of chalconyl derivative with two ring (3/-(4/- (decyloxy) phenyl-1-(4-(alkoxy) phenyl) prop-2-en-1-one) has been synthesized and characterized by a combination of elemental analysis and standard spectroscopic methods. In the series, the lower members (C-4 and C-5) exhibit only enantiotropic nematic mesophase but middle and higher members exhibit enantiotropic nematic as well as smectic mesophase. The nematic mesophase commence from C-4 homologue and smectic mesophase (smectic-A type texture) commence from C-6 homologue as enantiotropic and persists up to the last member synthesized. The mesomorphic properties of present series were compared with other two structurally similar series to study the effects of change of meta and para position on the mesomorphism.