${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ and ${\mathrm{NaHC}}_2{\mathrm{O}}_4$ behave as acids as well as reducing agents. Which are the correct statement?

Equivalent weight of ${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ and ${\mathrm{NaHC}}_2{\mathrm{O}}_4$ 4 are equal to their molecular weights when behaving as reducing agents.

100 mL of $1 N$solution of each is neutralized by same volume of $1N \mathrm{Ca}{\left(\mathrm{OH}\right)}_2$.

100 mL of $1 N$ solution of each is neutralized by same volumes of $1M \mathrm{Ca}{\left(\mathrm{OH}\right)}_2$ •

100 mL of $1 M$ solution of each is oxidized by same volume of $1 M {\mathrm{KMnO}}_4$ solution in acidic medium