Give the names of three D-aldohexoses that have the following properties.
a) Treatment of A & B with NaBH
4 gave the same optically active alditol whereas reduction of C gave a different alditol.
b) The Ruff degradation removes C2 on the carbohydrate. The Ruff degradation of A and B gave different D-pentoses.
c) The Ruff degradation of B & C gave the same optically active D-pentoses.