Compound A, \( \mathrm{C_{5}H_{10}O_{5}} \), given a tetraacetate with \( \mathrm{AC_{2}O} \) and oxidation of A with \( \mathrm{Br_{2}-H_{2}O} \) given an acid, \( \mathrm{C_{5}H_{10}O_{6}} \). Reduction of A with \( \mathrm{HI} \) gives isopentane. The possible structure of A is:
