Final answer:
Two possible geometries for acetonitrile molecules (CH3CN) are linear and trigonal planar.
Step-by-step explanation:
Two possible geometries for acetonitrile molecules (CH3CN) are linear and trigonal planar.
When considering the structure of the acetonitrile molecule, the carbon atom in the molecule is bonded to three hydrogen atoms and one nitrogen atom. The geometry around the carbon atom can be determined by considering the number of bonding electron pairs and the number of lone pairs on the atom. In the case of acetonitrile, there are no lone pairs on the carbon atom.
Since the carbon atom is bonded to three other atoms, it forms a trigonal planar geometry. The nitrogen atom, on the other hand, forms a linear geometry because it is bonded to only one atom, carbon.