A solution of (–$l$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :

Question

A solution of (–$l$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl₅, due to the formation of :

carbene