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\item Differemt physical properties  \item Often different chemical properties  \end{itemize}  \subsection{Structural Isomerism} Structural isomers have the same molecular formula but with a different structural formula  \subsubsection{Chain Isomerism}  \begin{itemize}  \item 4 or more carbon atoms  \item Different chain arrangements  \end{itemize}  \subsubsection{Position Isomerism}  \begin{itemize}  \item Functional group situated in different position on carbon chain  \end{itemize}  \subsubsection{Functional Group Isomerism}  \begin{itemize}  \item Same molecular formula, but different functional groups  \item Different homologoues series  \end{itemize}  \subsection{Stereoisomerism}  \begin{itemize}  \item Same structural formula  \item Differ in atom   \item Two kinds  \begin{itemize}  \item E/Z  \item Optical  \begin{itemize}  \item Not required  \end{itemize}  \end{itemize}  \end{itemize}  \subsubsection{E/Z Isomerism}  \begin{itemize}  \item Around a C=C bond  \item No rotation due to $\pi$ bond  \item E  \begin{itemize}  \item Different sides (Entgegen)  \end{itemize}  \item Z  \begin{itemize}  \item "Z"ame "Z"ide (Zusammen)  \end{itemize}  \end{itemize}