Chapter 144 of 2363 min read
Preparation and reactions; diazonium salts
Why this is asked: Diazonium salts are stable in solution only at 0–5°C — warm it and it hydrolyses to phenol with loss of N₂ gas, which is why every diazonium reaction is carried out cold and used immediately rather than stored. Azo-coupling with phenol needs mildly alkaline conditions and with aniline needs mildly acidic conditions, and it always occurs para to the activating group.
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- •Given below are two statements: Statement I: Benzenediazonium salt is prepared by the reaction of aniline with nitrous acid at 273–278 K. It decomposes easily in the dry state. Statement II: Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzenediazonium salt with KI. In the light of the above statements, choose the most appropriate answer from the options given below:
- •Identify the major product C formed in the following reaction sequence:
- •Given below are two statements: Statement I: Aniline does not undergo Friedel–Crafts alkylation reaction. Statement II: Aniline cannot be prepared through Gabriel synthesis. In the light of the above statements, choose the correct answer from the options given below:
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