Discussion
What does an auxochrome do?
Answer: B
An auxochrome such as a hydroxyl or amino group has no absorption band of its own in the usual range but shifts and intensifies the chromophore's when attached to it. It does not absorb alone, quench fluorescence or act primarily on solubility, though it may affect the latter. A group that modifies a property without possessing it is worth a name of its own, and the pair of terms together describes most of what determines an organic compound's colour. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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