On the basis of the information in the table, the arrangement of the binary compounds in order of increasing bond polarity is CH4 < SiCl4 < SF4.
A bond is said to be polar when there is a large difference in electronegativity between the atoms.
If we check out the electronegativity differences between the atoms, we have the following;
C - H = 2.5 - 2.1 = 0.4
Si - Cl = 3.0 - 1.8 = 1.2
S - F = 4.0 - 2.5 = 1.5
We can see that the highest electronegativity difference and highest polarity is observed in the S - F bond, followed by the Si - Cl bond and finally the C - H bond has the lowest electronegativity difference and lowest polarity.
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