Final answer:
The student's question deals with the ranking of compounds according to their maximal absorption wavelength in UV-Vis spectroscopy, which depends on molecular structure and conjugation.
Step-by-step explanation:
The question relates to the concept of UV-Vis spectroscopy in chemistry, specifically the absorption of light by molecules at different wavelengths. Molecules with extended systems of conjugated pi bonds tend to absorb light at longer wavelengths. Compounds such as carbonyl-containing molecules, DNA bases, and food colorings show characteristic absorption patterns in their UV-Vis spectra.
The maximal absorption wavelength (λmax) is a key factor in inferring the color of a compound and can be influenced by the structure of the molecule. For instance, compounds that absorb in the red region of the visible spectrum appear green and vice versa. The energy of a photon of light is inversely proportional to its wavelength, a principle that can be applied to find the energy at λmax using the Beer - Lambert Law or other related formulas.
The question asks to rank the compounds A, B, and C according to Imax (wavelength of maximum absorbance).
To determine the rank, we need information about the absorption spectra of these compounds. Unfortunately, the information given does not provide any specific details about the absorption spectra of the compounds A, B, and C.
Without this information, it is not possible to rank the compounds according to Imax. It is important to have the absorption spectra or information about the absorption maxima to make a proper comparison.