The CI-B-Cl bond angle in the BCl_3 molecule is O 180° O 90° O 120° 060° 109.5°

120°

Explanation:

Valence electrons of boron = 2

Valence electrons of chlorine = 7

The total number of the valence electrons = 3 + 3 (7) = 24

The Lewis structure is drawn in such a way that the octet of each atom in the molecule is complete. So,

The Lewis structure is:

There is no lone pair involved, so, It is of type AB₃.

According to the theory, the atoms will form a geometry in such a way that there is minimum repulsion and maximum stability.

So, it is of triangular shape, with bond angle, 120 °.