The polarity of a bond depends on the difference in electronegativities of the atoms involved in bonding. Greater this difference, greater is the polarity
1) In SCl2 we have the S-Cl bond
Electronegativity values: S = 2.5, Cl = 3
Difference = 3.0 -2.5 = 0.5
2) In F2 we have the F-F bond
Electronegativity value: F = 4.0
Difference = 4.0-4.0 = 0
3) In CS2 we have the C-S bond
Electronegativity value: C = 2.5, S = 2.5
Difference = 2.5 -2.5 = 0
4) In CF4 we have the C-F bond
Electronegativity values: C = 2.5, F = 4.0
Difference = 4.0 -2.5 = 1.5
5) In BrCl we have the Br-Cl bond
Electronegativity values: Br = 2.8, Cl = 3
Difference = 3.0 -2.8 = 0.2
Therefore, the increasing order of polarity is
F2 = CS2 < BrCl < SCl2 < CF4
The polarity of molecules depends on the difference in electronegativity between the atoms in the molecule.
Covalent bonds involve sharing of electrons between atoms. The electronegativity of an atom refers to its ability to attract the shared electrons in a bond closer to itself. The higher the difference in electronegativity between bonding atoms, the more polar the bond is.
Given the molecules shown in the question, the order of increasing bond polarity of the molecules is; F2 < CS2 < BrCl < SCl2 < CF4.
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