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In the following image, $\mathrm{CH}_2$ is connected to benzene rings with a $-\equiv-$ like symbol. What's the meaning of this symbol?

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This is a triple bond between two $\ce{C}$ atoms, i.e. $\ce{-C#C -}$. It is drawn that way because the carbon atoms in a triple bond are $\mathrm{sp}$-hybridised and thus exhibit a linear arrangement.

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  • $\begingroup$ If this is a triple bond, then why here the benzene rings are with a single bond? $\endgroup$
    – Sparkler
    Commented Dec 2, 2014 at 0:50
  • $\begingroup$ @Sparkler Sorry, I don't understand your question. Benzene rings can only directly be linked by a single bond, because you can't have a carbon atom with 5 bonds (notwithstanding very rare exceptions). If you link them via a carbon chain then this chain can contain single, double or triple bonds. $\endgroup$
    – Philipp
    Commented Dec 2, 2014 at 1:06

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