Discussion
What is a chromophore?
Answer: D
A chromophore is the structural feature responsible for the band - a carbonyl, a nitro group, an aromatic ring, a carbon-carbon double bond. Solvent, wavelength and reference are other things entirely. Because a given chromophore absorbs at a broadly similar wavelength wherever it appears, its presence can be inferred from a spectrum, which is what gives the technique qualitative value alongside the quantitative. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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