So gluconic acid is represented as II and
saccharic acid as III CHO
H
OH
OH
H
H
OH
H
OH
CH2OH
I
COOH
H
OH
OH
H
H
OH
H
OH
CH2OH
II
COOH
H
OH
OH
H
H
OH
H
OH
COOH
III
Glucose is correctly named as D(+)-glucose ‘D’ before the name
of glucose represents the configuration whereas ‘(+)’ represents
dextrorotatory nature of the molecule It should be remembered that
‘D’ and ‘L’ have no relation with the optical activity of the compound