In the reaction A is:
H+/H2O
HgSO4/H2SO4
Cu2Cl2
H3PO2 and H2O
As we learnt in
Conversion to Benzene -
By reacting benzene diazonium with H3PO2
- wherein
Option 1)
H+/H2O
This option is incorrect
Option 2)
HgSO4/H2SO4
This option is incorrect
Option 3)
Cu2Cl2
This option is incorrect
Option 4)
H3PO2 and H2O
This option is correct