Answer to Question #190977 in Organic Chemistry for Zee

Question

why sucrose exhibit optical activity

Answer 1

Syrup is optically active, but the amount of optical activity (the amount the sucrose sample rotates the plane of polarization) depends on the amount of sucrose in the light beam. The longest (tallest) sample, 3, deviates the most from pure water, i.e., it has the greatest effect on the plane of polarization.