From the following statements, which is INCORRECT?
A. Atoms in triple bonds are not free to rotate.
B. Atoms in double bonds are not free to rotate.
C. Atoms in a ring are free to rotate around their bonds.
D. Atoms connected by single bonds rotate around the bond.
Atoms in double or triple bonded systems are rigid and not free to rotate around these bonds. Furthermore, ring systems have aromatic character, and the atoms in these systems are also not free to rotate around their bonds. Only atoms connected by single bonds rotate around their signal bonds.