COMEDK202510 May 2025Evening ShiftChemistryAminesActual
Complete the following 2 reactions A & B by choosing appropriate reactants ([ X ] ) & ([ Y ] ).
Options
- A([ X ]= C ₆ H ₅ OH [ Y ]= C ₆ H ₅- N - ( CH ₃ )₂ )
- B([ X ]= C ₆ H ₅ Br [ Y ]= CH ₃ CH ₂- N - ( CH ₃ )₂ )
- C([ X ]= C ₆ H ₅ CHO [ Y ]= CH ₃- CO - CH ₃ )
- D([ X ]= C ₆ H ₅ NH ₂ [ Y ]= C ₆ H ₅ OH )
Correct answer
A. ([ X ]= C ₆ H ₅ OH [ Y ]= C ₆ H ₅- N - ( CH ₃ )₂ )
Step-by-step solution
The reactions shown are electrophilic aromatic substitution reactions, specifically diazo coupling reactions between a diazonium salt and an activated aromatic ring. In reaction A, benzenediazonium chloride reacts with [X] to form p-hydroxyazobenzene. This is a coupling reaction with phenol ( C ₆ H ₅ OH ) in an alkaline medium (indicated by OH ⁻ ). The phenol acts as the nucleophile, attacking the diazonium cation at the para position. In reaction B, benzenediazonium chloride reacts with [Y] to form p-dimethylamino