such as C6H14 and C6H6 -- which 1 is more polar?
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It's not so much a molecule's size that affects its polarity.
C6H14, or one of the hexanes, is very non-polar because all the carbon atoms are sp3/tetrahedral and also because the H-C bond has very little polarity. The tetrahedral character helps to cancel out what little polarity the C-H bond has.
Also, it depends on which C6H16 you mean. There are a number of possible isomers (5 I can think of now). The polarity will also depend on how branched the hexane in question is because it will affect the strength of the van der Waals interactions between the different molecules.
C6H6, I assume you mean benzene, will be more polar because its aromatic system will have a circulating electron cloud which also creates a small magnetic field. Also, sp2 hybridized carbons will have slightly stronger electronegativity than sp3 C atoms.
C6H14, or one of the hexanes, is very non-polar because all the carbon atoms are sp3/tetrahedral and also because the H-C bond has very little polarity. The tetrahedral character helps to cancel out what little polarity the C-H bond has.
Also, it depends on which C6H16 you mean. There are a number of possible isomers (5 I can think of now). The polarity will also depend on how branched the hexane in question is because it will affect the strength of the van der Waals interactions between the different molecules.
C6H6, I assume you mean benzene, will be more polar because its aromatic system will have a circulating electron cloud which also creates a small magnetic field. Also, sp2 hybridized carbons will have slightly stronger electronegativity than sp3 C atoms.