Diazonium, Sandmeyer and azo coupling products of drawn anilines

13 questions on Diazonium, Sandmeyer and azo coupling products of drawn anilines from the Amines and Aromatic Nitrogen Compounds chapter: 2 NEET level, 5 JEE Main, 6 JEE Advanced. Each one opens with its answer and solution.

• The amine shown is treated with NaNO2 and HCl at 0-5 degC. Which structure is the product? NEET level, drawn structure
• The benzenediazonium salt shown is warmed with CuCN/KCN (Sandmeyer reaction). Which structure is the product? NEET level, drawn structure
• The diazonium salt shown is treated with hypophosphorous acid (H3PO2). Which structure is the organic product? JEE Main level, drawn structure
• The diazonium tetrafluoroborate shown is heated to give an aryl fluoride (Balz-Schiemann), which is then oxidised with hot alkaline KMnO4 and acidified. Which s... JEE Advanced level, drawn structure
• The diazonium salt shown couples with phenol in mildly alkaline solution (pH about 9-10). Which structure is the major azo dye? JEE Main level, drawn structure
• The diazonium salt shown couples with N,N-dimethylaniline at pH about 4-5. Which structure is the major product? JEE Advanced level, drawn structure
• Why is the coupling of the diazonium salt shown with phenol carried out at pH about 9-10 rather than in strongly acidic solution? JEE Main level, drawn structure
• The aromatic amine shown is diazotised at 0-5 degC and the solution is then warmed with water. Which structure is the product? JEE Main level, drawn structure
• The aromatic amine shown is diazotised at 0-5 degC, the product is treated with CuCN/KCN, and the resulting compound is reduced with LiAlH4. Which structure is ... JEE Advanced level, drawn structure
• The salt shown is treated with different reagents. Select all the correct statements. JEE Main level, drawn structure
• The aromatic amine shown is diazotised at 0-5 degC, the product is treated with CuCN, and the resulting nitrile is hydrolysed with aqueous acid and heat. Which ... JEE Advanced level, drawn structure
• The amine shown is treated with excess bromine water, the product is diazotised at 0-5 degC, and the diazonium salt is treated with H3PO2. Which structure is th... JEE Advanced level, drawn structure
• The diamine shown is completely converted to the bis(diazonium) salt according to ArNH2 + NaNO2 + 2HCl -> ArN2^+Cl^- + NaCl + 2H2O applied to each amino group. ... JEE Advanced level, drawn structure