Which groups are responsible for colour ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Chromophores**: The term "chromophore" refers to specific groups of atoms within a molecule that are responsible for the absorption of light and, consequently, the color of that substance.

2. **Mechanism of Color Production**: When light, particularly white light, strikes a chromophore, it absorbs certain wavelengths (or colors) of light. The wavelengths that are not absorbed are reflected or transmitted, and these are the colors we perceive.

3. **Example of a Chromophore**: A common example of a chromophore is beta-carotene. Beta-carotene contains a highly conjugated system, which includes alternating single and double bonds. This conjugation allows for the absorption of specific wavelengths of light.

...