a) Draw the structures of the compounds listed below in groups of isomers and classify them according to their unique functional groups and number of carbons atoms. i. D-ribose ii. D-glyceraldehyde iii. D-glucose iv. D-xylose v. D-galactose vi. D-fructose vii. D-arabinose viii. Dihydroxyacetone ix. D-ribulose x. D-mannose