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A solution of (−)-1-chloro-1-phenylethane in toluene undergoes slow racemization when a small quantity of SbCl5 is added, because it forms a:

1. carbanion
2. carbene
3. carbocation
4. free radical

Correct answer: carbocation

Solution

The addition of SbCl5 facilitates the formation of a carbocation by stabilizing the positive charge, allowing for the racemization process to occur as the molecule can interconvert between enantiomers.

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