MCQ
For the below given cyclic hemiacetal $(X)$, the correct pyranose structure is.


- A

- B

- C

- ✓








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$pH$ values of $x$ and $y$ are respectively
$2Fe(s)\, + \,{O_2}\,(g)\, + \,4{H^ + }(aq)\, \to \,2F{e^{2 + }}(aq) + 2{H_2}O(l)\,;$ $E^o =1.67\,V$
At $[Fe^{2+}] = 10^{-3}\, M$, $p(O_2) = 0.1\,atm$ and $pH = 3$, the cell potential at $25\,^oC$ is .............. $\mathrm{V}$