How many stereoisomers exist for 2,3-dichlorobutane, including meso compounds?
Answer and explanation
Correct answer: B. stereoisomers (one pair of enantiomers and one meso compound)
- Step 1: 2,3-dichlorobutane has two chiral centers with identical substituents: C2 and C3.
- Step 2: Theoretical maximum is isomers: .
- Step 3: Due to internal plane of symmetry, the and forms are superimposable, representing a single achiral meso compound.
- Step 4: Total stereoisomers: and (pair of enantiomers) + meso compound = .
Answer
3 stereoisomers (one pair of enantiomers and one meso compound).
Why not the others: '' ignores the meso symmetry; '' omits the meso isomer; '' assumes all are superimposable.
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