Diazonium salts in synthesis
- 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 a… Answer: 1. Both Statement I and Statement II are correct Statement I is correct: diazotisation of aniline with NaNO₂/HCl is done at 273-278... 1
- Identify the product in the following reaction :Benzenediazonium chloride (C_6H_5N_2^+Cl^-) with (i) Cu_2Br_2/HBr (ii) Mg/dry ether (iii) H_2O → Product Answer: 3. benzene (structure) Key idea: Follow each step: Sandmeyer reaction, then Grignard formation, then hydrolysis. C₆H₅N₂^+Cl^- with C... 1
- The product formed from the following reaction sequence is[benzonitrile] [(iii) H_2O](i) LiAlH_4, H_2O;\ (ii) NaNO_2 + HCl Answer: 1. [structure in figure] Key idea: follow each step. LiAlH₄ reduces the nitrile C₆H₅CN to the primary amine C₆H₅CH₂NH₂ (benzylamine)... 1
- Which of the following sequence of reactions is suitable to synthesize chlorobenzene ? Answer: 2. Benzene, Cl₂ , anhydrous FeCl₃ Key idea: chlorobenzene is made by electrophilic substitution of benzene with Cl₂ and a Lewis acid... 1
- The reagent 'R' in the given sequence of chemical reaction is :2,4,6-tribromoaniline NaNO_2, HCl,\ 0-5^° C 2,4,6-tribromobenzenediazonium chloride R 1,3,5-tribromobenzene Answer: 2. CH₃CH₂OH Key idea: replacing the diazonium group by hydrogen (hydro-de-diazoniation) needs a mild reducing agent. Ethanol (or H₃P... 1
- A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO_2 to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula C_12H_10N_2O. The structure of compoun… Answer: 1. nitrobenzene ( C₆H₅NO₂ ) Key idea: nitro compound → amine → diazonium salt → azo dye. C₆H₅NO₂xrightarrowSn/HClC₆H₅NH₂ C₆H₅NH₂xrig... 1