A solution of (+)-2-chloro-2-Phenyl Ethane in toluene racemises slowly in the presence of small amount of ${\mathrm{SbCl}}_5$, due to the formation of

Explanation:

The racemization of (+)-2-chloro-2-phenyl ethane (which is a chiral compound) occurs due to the formation of a planar carbocation intermediate. When a base (like sodium hydroxide, NaOH) is present, it can abstract a proton from the β-carbon of the molecule, resulting in the formation of a carbocation at the chiral center. This carbocation is planar and can be attacked from either side, leading to the formation of both the R and S enantiomers. This process is known as racemization, as it converts the optically active (+)-enantiomer into a racemic mixture (an equal mixture of both R and S enantiomers).