For assigning
Rationalised 2023-24
285
Biomolecules
the configuration of monosaccharides, it is the lowest asymmetric carbon
atom (as shown below) which is compared As in (+)   glucose, —OH on
the lowest asymmetric carbon is on the right side which is comparable
to (+) glyceraldehyde, so (+) glucose is assigned D-configuration Other
asymmetric carbon atoms of glucose are not considered for this
comparison Also, the structure of glucose and glyceraldehyde is written
in a way that most oxidised carbon (in this case –CHO)is at the top