Question

The total number of rotational and vibrational degrees of freedom for propene (C₃H₆), a nonlinear molecule with 9 atoms, are, respectively:

• A. 0 and 21
• B. 1 and 21
• C. 3 and 21
• D. 2 and 22

Hint:

Nonlinear molecule: translational = 3, rotational = 3, vibrational = 3N - 6.

Answer 1

The Correct Option is C

Nonlinear molecule always has 3 rotational DOF. Vibrational = 3N-6 = 3(9)-6 = 21.

\[\boxed{3 \text{ and } 21}\]