An increase in the number of hydroxyl groups on the right ring on anthocyanins shifts the color from red to blue.

Question

Quizplus · Accepted Answer

The presence of more hydroxyl groups on the right ring of anthocyanins increases the molecule's ability to stabilize the flavylium cation form, which is associated with a shift in color towards blue. This is due to the increased electron donation to the chromophore, affecting the light absorption characteristics and thus the perceived color.

An Increase in the Number of Hydroxyl Groups on the Right