126 g oxalic acid ($$\text{H}_2\text{C}_2\text{O}_4 \cdot 2\text{H}_2\text{O}$$) under acidic conditions will be oxidized by

(i) $$\frac{1}{3}$$ mole of $$\text{K}_2\text{Cr}_2\text{O}_7$$

(ii) $$\frac{5}{2}$$ mol $$\text{K}_2\text{Cr}_2\text{O}_7$$

(iii) $$\frac{1}{3}$$ mol $$\text{KMnO}_4$$ 

(iv) $$\frac{5}{2}$$ mol $$\text{KMnO}_4$$

A

i and iii only

B

i and iv only

C

ii and iii only

D

ii and iv only