G What is the major problem with using Friedel-Crafts alkylation to mono-alkylate an aromatic ring?

Explanation:

Following are the problems to mono-alkylate the aromatic ring .

1 ) The carbocations formed in the process undergo rearrangement when the number of carbon to be added in the alkylation process is more than two .

2 ) The formed monoalkylated product is more reactive than reactant so reaction does not stop after monoalkylation . Dialkylation and tri alkylation product too are simultaneously formed . This can be controlled by using benzene in excess as reactant . Monohalo benzene or nitrobenzene  are  too weak to undergo Friedel craft reaction because of presence of deactivating

group .

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explanation: