Miscible covalent compound

Because chlorine is more electronegative than carbon, carbon tetrachloride has four polar covalent bonds. But, as pointed out earlier, the molecular symmetry cancels out the electric dipoles of the individual bonds. The result is a nonpolar molecule. Like water, carbon tetrachloride is a good solvent. At one time, it was used as a dry cleaning agent. Water and carbon tetrachloride, however, dissolve entirely different classes of compounds. Carbon tetrachloride forms solutions with nonpolar organic compounds. It is infinitely miscible, for example, with benzene, whereas water and benzene do not mix. 

The question as to whether hydrogen-bonded complexes are miscible with normal covalently bonded liquid-crystalline compounds arises for their application. Binary phase diagrams of a hydrogen-bonded mesogenic complex with normal liquid crystals have been prepared to examine the miscibility of two different classes of liquid crystals [67], Compound 16 or 4 -heptyl-4-cyanobi-phenyl was mixed with complex 14, These are miscible over the whole range of composition, A smectic C phase is induced for a mixture of 16 and the cyanobiphenyl. 

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