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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