HydrocarbonsHard
Question
Identify a reagrnt from the following list which can easily distinguish between 1-butyne and 2- butyne.
Options
A.bromin, CCl4
B.H2, Lindlar catalyst
C.dilute H2SO4, HgSO4
D.ammoniacal Cu2Cl2 reaction
Solution
Butyne -1 gives red ppt. with ammonical Cu2Cl2 solution due to presence of acidic hydrogen while butyne - 2 does not react.
2CH3 - CH2 - C ≡ CH + Cu2Cl2 + 2NH4OH →
butyne-1
2CH3 - CH2 - C ≡ C.Cu↓ + 2NH4Cl + 2H2O
red PPt.
CH3 - C ≡ C - CH3 + Cu2Cl2 + 2NH4OH→
Butyne - 2
2CH3 - CH2 - C ≡ CH + Cu2Cl2 + 2NH4OH →
butyne-1
2CH3 - CH2 - C ≡ C.Cu↓ + 2NH4Cl + 2H2O
red PPt.
CH3 - C ≡ C - CH3 + Cu2Cl2 + 2NH4OH→
Butyne - 2
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