Question

Benzene is colourless, but it's isomer, fulvene is yellow. How will explain it?

Answer 1

Answer:

The frequency of light absorbed corresponds the the complementray colour of the colour we see in azo dyes. Benzene only contains a small area of delocalisation, which is not sufficient to lower the energy gap to the visible part of the spectrum, meaning benzene absorbs UV light, and is colourless