How many stereocenters (chiral carbon atoms) are present in a 2-bromo-3-chlorobutane molecule?
Answer and explanation
Correct answer: A. 2
The chemical structure of 2-bromo-3-chlorobutane is CH3-CH(Br)-CH(Cl)-CH3. Carbon-2 is bonded to four different groups: -H, -Br, -CH3, and -CH(Cl)CH3. Carbon-3 is bonded to four different groups: -H, -Cl, -CH3, and -CH(Br)CH3. Carbon-1 and Carbon-4 are methyl carbons bonded to three hydrogens (achiral). Therefore, there are exactly 2 chiral carbon stereocenters.
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