Question

Replacement of diazonium ground by halogen atom can be done by the reaction
(a) Ullmann reaction
(c) Sandmeyer's reaction
(b) Fittig reaction
(d) Friedel Craft reaction

Answer 1

Answer:

Replacement by a hydroxyl group The phenol formed may react with the diazonium salt and hence the reaction is carried in the presence of an acid which suppresses this further reaction. A Sandmeyer-type hydroxylation is also possible using Cu2O and Cu2+ in water.