Question

18.The observed optical rotation of a sample containing two enantiomers is found to be + 12^° and the specific rotations of the dextro-isomer is + 24^° . Both observed and specific rotations are measured under identical conditions. Then optical purity and % composition of the sample will be (a) optical purity = 50% ; the mixture contains 75% dextro isomer and 25% levoisomer (b) optical purity = 50%, the mixture contains 25% dextro isomer and 75% levoisomer (c) optical purity = 50%; the mixture contains 50% dextro isomer and 50% levoisomer (d) optical purity = 70%, the mixture contains 85% dextro isomer and 15% levoisomer

Answer 1