Question

Is the following sugar, D-sugar or L-sugar?

Answer 1

         L-sugar

\[\begin{array}{cc}
\phantom{.....}\ce{^1CHO}\\
\phantom{...}|\\
\ce{HO - ^2C - H}\\
\phantom{...}|\\
\phantom{........}\ce{\underset{L-Glyceraldehyde}{^3CH2OH}}
\end{array}\]

Because the H and OH on C₄ carbon is in the same configuration as the H and OH on C₂
carbon in L-Glyceraldehyde.