The source of absorbance of light at a wavelength of 6600 nm would be:

Question

Quizplus · Accepted Answer

Absorbance of light at a wavelength of 6600 nm corresponds to the far-infrared region of the electromagnetic spectrum which is typically associated with vibrational modes such as bond stretching (b), in-plane bending (c), and out-of-plane bending (d). π → π* electron transitions (a) typically take place at higher energy levels corresponding to UV-vis region. Therefore, the best choice would be option (E) which includes all the vibrational modes mentioned above.

The Source of Absorbance of Light at a Wavelength of 6600