Identify the following sugars:
a. An aldopentose that is not D-arabinose forms D-arabinitol when it is reduced with NaBH4.
b. A sugar forms the same osazone as D-galactose with phenylhydrazine, but it is not oxidized by an aqueous solution of Br2
c. A sugar that is not D-altrose forms D-altraric acid when it reacts with nitric acid.
d. A ketose, when reduced with forms D-altritol and D-allitol. H2 + Pd/C,