The reason behind the use of ferrocene in the experiment is because it reacts much faster than benzene.
Ferrocene is an organometallic compound which consist of two cyclopentadienyl rings bound to a central atom of iron.
The aromatic cyclopentadienyl rings in ferrocene have a lot of electrons and go through a lot of the same reactions as benzene.
In fact, most metallocenes are more electrophilic reagent reactive than benzene, indicating that electrons are more readily available.
Thus, the reason behind the use of ferrocene in the experiment is because it reacts much faster than benzene.
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