Fittig's reaction produces

The following reaction is:

Diphenyls are a potential threat to the environment. How are these produced from aryl halides?

Which has maximum dipole moment?

Write the nucleophilic substitution reactions of $Cl^-$ in $C-Cl$ bond of haloarenes with $OH^-$.

Chlorobenzene reacts with bromine gas in the presence of $Anhyd. AlBr_3$ to yield $p-$Bromochlorobenzene. This reaction is classified as . . . . . .