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
