\textbf{210 --} How many of the following statements are correct?
\begin{itemize}
\item From acetylene, many organic compounds can be prepared.
\item From the reaction of water with calcium carbide, acetylene gas is obtained.
\item Acetylene is the simplest alkyne and its molecule is linear and nonpolar.
\item Polypropylene is part of the synthesized compounds and is used in carpet and rug production.
\end{itemize}
\hspace{2cm} (1) 1 \hspace{2cm} (2) 2 \hspace{2cm} (3) 3 \hspace{2cm} (4) 4