\textbf{209-} The \textbf{ball-and-stick} model ............ molecule shows ............ and the presence of ............ hydroxyl groups in this molecule is confirmed.
\textit{[Figure: Ball-and-stick molecular model showing a chain of carbon atoms with OH groups]}
\begin{enumerate}
\item[(1)] ball and stick -- glucose -- five
\item[(2)] ball and stick -- glycerol -- three
\item[(3)] structural expanded -- glucose -- five
\item[(4)] structural expanded -- glycerol -- three
\end{enumerate}
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