Chemistry
Grade-10
Easy
Question
Which of the pigment found in the red cabbage changes color when acid or base is added to it?
- Carotenoids
- Chlorophylls
- Anthocyanina
- Flavonoids
Hint:
Anthocyanins are quite common in fruits and vegetables.
The correct answer is: Anthocyanina
Red cabbage contain anthocyanin molecule. This structure happens to be very sensitive to the acidity of the environment surrounding it. It influences how it organizes the electrons within the molecule.
An acidic environment contains a lot of protons (H+). This results in the anthocyanin structure we shared above (with the O+). However, under less acidic conditions, this O+-group will lose its positive charge, resulting in other structural changes. These structural changes cause the molecule to interact differently with light and that results in a different color.
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