Which molecule has the highest total number of internal degrees of freedom?

Question

Quizplus · Accepted Answer

The total number of internal degrees of freedom is equal to the number of atoms in the molecule minus the number of constraints. C₆H₆ has 12 atoms and 6 constraints (3 translational, 2 rotational, and 1 vibrational), so it has 6 internal degrees of freedom. C₂H₅OH has 9 atoms and 6 constraints, so it has 3 internal degrees of freedom. C₂H₅OCH₃ has 11 atoms and 6 constraints, so it has 5 internal degrees of freedom. Therefore, C₆H₆ and C₂H₅OCH₃ have the highest total number of internal degrees of freedom.

Which Molecule Has the Highest Total Number of Internal Degrees