\textbf{210-} In which two compounds given below, the number of carbon isomers is equal?
\begin{itemize}
\item[(1)] benzaldehyde, 2-heptanone \hfill (2) ethyl butanoate, heptane
\item[(3)] trimethylamine, 2-methylpropane \hfill (4) 2 and 5-dimethylhexane, naphthalene
\end{itemize}