Tartaric acid occurs in certain wines. It can be prepared in the laboratory in two stages. $\text{OHCCHO} \xrightarrow{\text{step 1}}$ intermediate $\xrightarrow{\text{step 2}} \text{HO}_2\text{CCH(OH)CH(OH)CO}_2\text{H}$. Which reagents would be suitable for this synthesis?
- Astep 1: $\text{HCl(aq)}$; step 2: $\text{HCN(g)}$
- Bstep 1: $\text{HCN},\ \text{NaCN(aq/alcoholic)}$; step 2: $\text{H}_2\text{SO}_4\text{(aq)}$
- Cstep 1: $\text{H}_2\text{SO}_4\text{(aq)}$; step 2: $\text{K}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4\text{(aq)}$
- Dstep 1: $\text{KCN(aq/alcoholic)}$; step 2: $\text{K}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4\text{(aq)}$