CBSE Class 12 · 2009 · All India · Compounds Containing NitrogenShort Answer

Complete the following reaction equations:
i) (the diazonium reaction shown in the figure)
ii) C₆H₅N₂Cl + H₃PO₂ + H₂O →
iii) C₆H₅NH₂ + Br₂(aq) →

Answer: (ii) C₆H₆ + N₂ + H₃PO₃ + HCl (deamination). (iii) 2,4,6-Tribromoaniline (white ppt) + 3HBr. (i) Per the printed reagent.

Solution

(i) The displayed diazonium + its printed partner give the standard replacement/coupling product — write it off the figure.
(ii)

C_{6} H_{5} N_{2} Cl + H_{3} P O_{2} + H_{2} O \to C_{6} H_{6} + N_{2} ↑ + H_{3} P O_{3} + HCl

(hypophosphorous acid removes the diazo group).
(iii)

C_{6} H_{5} N H_{2} + 3B r_{2} (aq) \to 2, 4, 6 - B r_{3} C_{6} H_{2} N H_{2} ↓ + 3HBr

CBSE Class 12 Board · 2009 · All India · Subjective