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- The diazotization of aniline first involves the formation of NO+ (nitrosonium ion) by the dehydration of nitrous acid with sulfuric acid. The aniline nitrogen then acts as a nucleophile and eventually loses water. Propose a mechanism for the formation of the dizaonium salt of aniline. Use curved arrows to show all electron movement.Propose a two step synthesis.Propose a synthesize OH НО х ОН