Discussion
An auxochrome such as a hydroxyl or amino group affects a chromophore by
Answer: D
Correct answer: shifting and intensifying its absorption
An auxochrome carries a lone pair that can conjugate with the chromophore, extending the delocalised system. That lowers the energy gap, so the absorption moves to longer wavelength - a bathochromic shift - and it usually increases the intensity as well, a hyperchromic effect. Hydroxyl, amino and halogen substituents all act this way, which is why phenol absorbs at longer wavelength than benzene.
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