Question

The spatial arrangement of the given molecule is denoted by:

Options

• L−

• + or − sign before the molecule

• D or L sign before the molecule

• D+

Answer 1

D or L sign before the molecule

Explanation:

The letters ‘D’ or ‘L’ before the name of any compound indicates the relative configuration of a particular stereoisomer of a compound with respect to the configuration of some other compound, the configuration of which is known. In the case of carbohydrates, this refers to their relationship with a particular isomer of glyceraldehyde. When the −OH group lies on the right-hand side in the structure it is said to have a D-configuration. In L configuration −OH group is on the left-hand side of the asymmetric C.