(C) Benzene is obtained by the cyclic polymerization of acetylene $(C_2H_2)$.When acetylene gas is passed through a red-hot iron tube at $873 \ K$,it

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By the polymerization of three $C_2H_2$ molecules

(C) Benzene is obtained by the cyclic polymerization of acetylene $(C_2H_2)$.When acetylene gas is passed through a red-hot iron tube at $873 \ K$,it undergoes cyclic polymerization to form benzene $(C_6H_6)$.The reaction is: $3C_2H_2 \xrightarrow{873 \ K, \text{Fe tube}} C_6H_6$.