Question

Increasing Oder of bond angle of bcl3 alcl3 gacl3

Answer 1

Explanation:

Since, elements boron, aluminium and gallium all belongs to the same group. And, when we move down the group then there will be decrease in the electronegativity of an atom.

As boron is smaller in size so, electrons will be more closer towards it. As a result, there will occur electronic repulsion between the electrons due to which the surrounding atoms will move away from it.

Therefore, there will be increase in bond angle.

Thus, we can conclude that increasing order to bond angle is as follows.

                  $GaCl_{3}$ < $AlCl_{3}$ < $BCl_{3}$