Question

Which of the following is not an IR vibrational mode?
A.Stretching
B. Scissoring
C. Rocking
D. Rolling

Answer 1

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Which of the following is not an IR vibrational mode?
A.Stretching
B. Scissoring
C. Rocking
D. Rolling

✔️✔️$<b><u>Option D correct answer$✔️✔️

Rolling


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Answer 2

Among the given options, the one which is not an IR vibrational mode is option (d). Rolling.

• Infrared light (IR), which has high energy, causes bonds in a compound to vibrate. This is called IR vibrations.
• The normal modes of vibration are: asymmetric, symmetric, wagging, twisting, scissoring, stretching, and rocking for polyatomic molecules.
• Scissoring mode of vibration is the movement of two atoms toward and away from each other.
• The rocking mode of vibration is like the motion of a pendulum on a clock.
• The stretching mode of vibration occurs when there is a continuous change in the interatomic distance along the axis of the bond between two atoms.
• Rocking and scissoring are bending vibrations.

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