1.

(+)-1-chloro-1-phenylethane is toluene racemises slowly in the presence of small amount of SbCl_(5) due to the formation of:

Answer»

carbocation
carbene
free radical
carbonion

Solution :A carbocation INTERMEDIATE is FORMED in the presence of `SbCl_(5)`. As the carbocation is PLANAR, it can be attacked by `SbCl_(6)^(-)` to give two enantiomers of 1-chlorophenylethane. The enentiomers lead to RACEMISATION and give a racemic mixture.
`CH_(3)-underset(H)underset(|)overset(Cl)overset(|)(C)-C_(6)H_(5)overset(-Cl^(-))toCH_(3)-underset(("Intermediate"))overset(o+)(C)H-C_(6)H_(5)`


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