Q36 / 160 · WBJEE 2009 · Chemistry

Ethelene can be separated from acetylene by passing the mixture through :

  • A
    fuming $\mathrm{H}_2 \mathrm{SO}_4$
  • B
    pyrogallol
  • Correct answer
    C
    ammoniacal $\mathrm{Cu}_2 \mathrm{Cl}_2$
  • D
    Charcoal powder

Solution

Hints : $\mathrm{H}-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}+\mathrm{Cu}_2 \mathrm{Cl}_2 \rightarrow \mathrm{Cu}^{+} \mathrm{C}^{-} \equiv \mathrm{C}^{-} \mathrm{Cu}^{+} \downarrow$ Red ppt. $$ \mathrm{H}_2 \mathrm{C}=\mathrm{CH}_2+\mathrm{Cu}_2 \mathrm{Cl}_2 \rightarrow \mathrm{No} . \mathrm{ppt} $$

Hence, the correct answer is option: 'C'.

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