Question

. The number of vibrational degree of freedom possessed by CH4 is
(A) 10
(B) 6
(D) 9
(C) 5​

Answer 1

3N-6 degrees of freedom constitute vibrational motion of Methane

Answer 2

Given: The given molecule is methane.

To find: We have to find the number of vibrational degrees of freedom.

Solution:

To determine the number of vibrational degrees of freedom of methane we have to use the below formula-

For non-linear molecules like methane, the degrees of freedom can be calculated by 3N-6.

Where N is the total number of elements in the molecule.

Methane has a total of 5 elements.

Thus we can write-

3×5-6

=15-6

=9

The number of vibrational degrees of freedom for methane is 9.

Hence the correct option is D.