This study aimed at synthesizing and studying the mesomorphic properties and the thermal behavior of four novel calamitic fluorinated chiral organosiloxane liquid crystals using established protocols and procedures. The four mesogenic materials (7a, 7b, 7c& 7d), contain a chiral side chain with 7 carbons, while the other side chain is made up of long chain hydrocarbon terminated by an organosiloxane. The lengths of the carbon chain tail are (C-7, C-8, C-10, and C-11) respectively. The general name of the synthesized LCs is (R)-heptan-2-yl 4'-((2-fluoro-4-((n- (1,1,1,3,5,5,5-heptamethyltrisiloxan-3yl)alkenyl)oxy)benzoyl)oxy)-3'-nitro [1,1'biphe -nyl]-4-carboxylate, where n= 7, 8, 10 &11 for 7a, 7b, 7c & 7d, respectively. The yield of the four synthesized LCs was: 30.2%, 54.2%, 13.4%, and 40.7% for 7a, 7b, 7c & 7d, respectively. The structures of all synthesized final products and intermediates were characterized using 1 H-NMR, and 13C-NMR spectroscopy. However, phase transition behavior was studied using polarized optical microscopy (POM). The four mesogenic materials C 7 (7a), C-8 (7b), C-10 (7c) and C-11 (7d) do exhibit biphasic SmA* and SmC* phases upon cooling (and heating). Moreover, this study confirms that all the liquid crystals (7a, 7b, 7c& 7d) show ferroelectric response, and so they are ferroelectric LC (FLC).