Difficult
$2CaC_2$ $\xrightarrow{H_2O} X$ $\xrightarrow{Cu_2Cl_2 + NH_4Cl} Y$ ; $Y$ is
- A$CH \equiv CCu$
- B$CuC \equiv CCu$
- C$CH \equiv C - C \equiv CH$
- D$CH_2 = CH - C \equiv CH$
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