MCQ
$X$ can be prepared by except


- A

- B

- C

- ✓$C{H_3} - C \equiv CH\,\xrightarrow[{Fe\,tube}]{{\operatorname{Re} d\,hot}}$




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$Mg^{2+} + 2{e^ - } \to Mg(s)\;E^o = - 2.37\,V$
$Cu^{2+} + 2e^- \to Cu(s)\;E^o = + 0.34\,V$