[(1)] The number of glucose units in the molecules of fiber-forming polymers is equal.
[(2)] From the perspective of molar mass, olive oil can be considered intermediate between polyatonin and insulin.
[(3)] In the structure of polyacrylonitrile, polytetrafluoroethylene, and polyvinyl chloride, non-bonding electron pairs exist.
[(4)] Natural polymers, like synthetic polymers, are formed through covalent bonds between their monomer units.
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\textbf{92 --} Which statement is correct?
\begin{enumerate}
\item[(1)] The number of glucose units in the molecules of fiber-forming polymers is equal.
\item[(2)] From the perspective of molar mass, olive oil can be considered intermediate between polyatonin and insulin.
\item[(3)] In the structure of polyacrylonitrile, polytetrafluoroethylene, and polyvinyl chloride, non-bonding electron pairs exist.
\item[(4)] Natural polymers, like synthetic polymers, are formed through covalent bonds between their monomer units.
\end{enumerate}
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