A family of benzylidene aniline compounds with variable end chains (for n = 1, 2, 4, 8 and m = 16) are synthesized by placing the electro-negatiue oxygen atom on either side of the rigid core (nO.m, n.Om), on both sides of the rigid core (nO.Om) and with the absence of oxygen on rigid core moiety (n.m). The mesomorphic properties are studied by using Thermal Microscopy (TM) and Differential Scanning Calorimetry (DSC). The depression/elevation of melting/clearing temperature and the nature of liquid crystallinity are presented as a function of position of oxygen with end chains.