Question

Which if the following species
possesses both C3 and C2 axes?
Select one:
je
A. SO3
B. [H30]+
C. NH3
D. PC13​

Answer 1

Answer:

C. NH3

Explanation:

In case of ammonia molecule (NH3), there are 4 atoms of which N is the central atom and there are 3 hydrogen atoms.

If you could think of an axis of rotation that passes through the central Nitrogen atom and one of the hydrogen atoms, which also bisects the H-N-H angle, then you COULD have a C2 axis of symmetry. In order for this to be even possible, NH3 will have to be a triangular (trigonal planr) molecule with nitrogen at the center of the triangle, which would sort of look like a BF3 molecule.