Give the reaction for the cyclization of ethyne,or the reaction for passing ethyne through a red-hot iron tube.

  • A
    $3C_2H_2 \xrightarrow{Red \ hot \ Fe \ tube, 873K} C_6H_6$
  • B
    $2C_2H_2 \xrightarrow{Red \ hot \ Fe \ tube, 873K} C_4H_4$
  • C
    $3C_2H_2 \xrightarrow{Red \ hot \ Fe \ tube, 873K} C_6H_6 + 3H_2$
  • D
    $C_2H_2 \xrightarrow{Red \ hot \ Fe \ tube, 873K} C_2H_4$

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