Question

Some biphenyl (C6H5-C6H5) is produced as a by-product in the synthesis of benzoic acid. Where does it come from? This question has to deal with the Grignard reaction.

Can anyone help me with this please?
This may be close, although not exactly, what you are looking for.
http://en.wikipedia.org/wiki/Wurtz_reaction
Mg (s) + 2C6H5-Br (l) = C6H5-C6H5 + Br-Mg-Br

Mg + C6H5-Br = C6H5-Br-Mg
C6H5-Br-Mg = Grignard

C6H5-C6H5 is a by-product from synthesis of reagenset

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