Question

which of the following images represents a trigonal planar molecular geometry?

Explanation:

Trigonal planar molecular geometry has a central atom bonded to three other atoms (or groups) with bond angles of approximately 120° and all atoms lie in the same plane. The bottom - most (teal - bordered) image shows a central atom with three surrounding atoms arranged in a trigonal planar fashion (like a flat triangle in terms of the arrangement of the outer atoms around the center). The first (yellow - bordered) is a trigonal bipyramidal or similar (more than 3 outer atoms), the second (blue - bordered) is linear (2 outer atoms), and the third (orange - bordered) has a different geometry (more like tetrahedral - like with extra atoms or a different arrangement).

Answer:

The image with the teal border (the bottom - most image among the four) represents a trigonal planar molecular geometry.