Exams › JEE Main › Chemistry

When the shade of a dye becomes deeper, the absorption band moves toward the red end of the spectrum. What is this shift called?

1. bathochromic shift
2. hypsochromic shift
3. hyperchromic shift
4. auxochromic shift

Correct answer: bathochromic shift

Solution

A bathochromic (red) shift moves the absorption band to longer wavelengths, deepening the colour. A hypsochromic shift is the opposite (blue, shorter wavelength); hyperchromic/hypochromic refer to intensity, not position.

Related JEE Main Chemistry questions

• Lactic acid loses its optical activity when the hydroxyl group is replaced by hydrogen because
• Which is the most suitable technique for separating a mixture of sugars?
• Which statement correctly compares the staggered and eclipsed conformations of ethane?
• Which statement correctly describes a common feature shared by optical and geometrical isomerism?
• Which substituent lowers the reactivity of a benzene ring toward electrophilic substitution, yet still mainly directs a new group to the ortho and para positions?
• Among the following substances, which has the greatest affinity for a proton?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →