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CH3–CHCl–CH2–CH3 has a chiral centre. Which one of the following represents its R-configuration?

1. C2H5 | H–C–Cl | CH3
2. C2H5 | Cl–C–CH3 | H
3. CH3 | H–C–Cl | C2H5
4. H3C–C–Cl | C2H5 | H

Correct answer: C2H5 | Cl–C–CH3 | H

Solution

The R-configuration is determined by assigning priorities to the groups attached to the chiral carbon based on the Cahn-Ingold-Prelog rules. Option B correctly represents the R-configuration for the given compound.

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