Which bond is more polar B-Cl or C-Cl ?

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The difference in the electronegativities of chlorine and boron is 3.0 - 2.0 = 1.0 ; the difference in between chlorine and carbon is 3.0 = 2.5 = 0.5 .

Consequently, the B-Cl bond is more polar ; the chlorine atom asrries the partial negative charge because it has higher electronegativity .

We should be able to reach this same conclusion without using a table of electronegativties ; we need a periodic table and because boron is to the left of carbon in the periodic table ,we will predict that is has a lower attraction for electron , Chlorine being on the right side of the table has a stronger attraction for electrons.The more polar bond will be the one between the atoms having the lowest attractions of electrons and the highest attraction .


B-Cl is more polar