Discussion
What does an auxochrome do?
Answer: A
An auxochrome such as hydroxyl, amino or halogen has no band of its own in the accessible range but shifts and usually intensifies the chromophore's when attached. It does not absorb alone or suppress absorption, and any solubility effect is incidental. A group that modifies a property it does not itself possess earns a name of its own, and the two terms together account for most of what sets an organic compound's colour. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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