Which of the following catalysts is used in t | vedclass

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(C) The cyclic polymerization (cyclotrimerization) of ethyne $(CH \equiv CH)$ to benzene $(C_6H_6)$ is typically carried out by passing the gas throug

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$NbCl_3$

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(C) The cyclic polymerization (cyclotrimerization) of ethyne $(CH \equiv CH)$ to benzene $(C_6H_6)$ is typically carried out by passing the gas through a red-hot iron tube at $873 \ K$. However,transition metal halides like $NbCl_3$ (Niobium$(III)$ chloride) are also known to catalyze this specific reaction. $3 CH \equiv CH \xrightarrow{NbCl_3} C_6H_6$

Which of the following catalysts is used in the polymerization of $CH \equiv CH$ to $C_6H_6$?

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