Question

The number of normal modes of vibration in benzene is _ _ _. (answer in integer)

Hint:

For linear molecules use $3N-5$, while for non-linear molecules use $3N-6$ normal vibrational modes

Answer 1

Correct Answer: 30

Step 1: Type of molecule.
Benzene is non-linear with 12 atoms.

Step 2: Use the formula.
\[ 3N - 6 = 3(12) - 6 = 30 \]

Step 3: Answer.
\[ \boxed{30} \]