The electronegativity difference of the Al and Cl atoms in AlCl₃ molecule is 1.55 while the electronegativity difference of the Al and Br atoms in AlBr₃ is 1.35
The electronegativity difference of atoms in AlCl₃ molecules is as follows:
3.16 - 1.61 = 1.55
The electronegativity difference of atoms in AlBr₃ molecules is as follows:
2.96 - 1.61 = 1.35
- Both the molecules have a significant amount of difference in the electronegativity of atoms → This shows that both molecules have polar character.
- But, the electronegativity difference in molecule AlCl₃ is 1.55, which is greater than 1.35 of the AlBr₃.
Therefore AlCl₃ is more polar molecule than AlBr₃
