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Dec 2, 2014 at 1:11 vote accept Sparkler
Dec 2, 2014 at 1:06 comment added Philipp @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.
Dec 2, 2014 at 0:50 comment added Sparkler If this is a triple bond, then why here the benzene rings are with a single bond?
Dec 2, 2014 at 0:44 history answered Philipp CC BY-SA 3.0