When diazonium salt is treated with H3PO2 followed by hydrolysis, it diazonium group is replaced by −H resulting to the formation of hydrocarbon. Thus, A must be H3PO2/H2O. 
In the reaction, NEET 2013 Chemistry, Hydrocarbons — question figure A is
NEET UG 2013 — Chemistry Organic Chemistry
2013mcqhard
In the reaction, 
A is
Official previous-year question
Held on 30 Apr 2013 · Verified 9 Jul 2026.
Options
- A
HgSO4/H2SO4
- B
Cu2Cl2
- C
H3PO2 and H2O
- D
H+/H2O
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