What is the configuration of the asymmetric centers in the following structures?
(a) (b) (c)

Question

What is the configuration of the asymmetric centers in the following structures? (a) (b) (c)

TestHub · Accepted Answer

(a) 1-bromo-1-chloroethane: priorities Br $>$ Cl $>$ CH₃ $>$ H; with H behind, Br $\to$ Cl $\to$ CH₃ runs anticlockwise : S.

(b) 3-chloropentan-2-ol: C₂ priorities OH $>$ C₃(Cl) $>$ CH₃ $>$ H : S; C₃ priorities Cl $>$ C₂(O) $>$ C₂H₅ $>$ H : S : (2S, 3S).

(c) 2-amino-3-hydroxybutanoic acid: C₂ priorities NH₂ $>$ CO₂H $>$ C₃(O) $>$ H : S; C₃ priorities OH $>$ C₂(N) $>$ CH₃ $>$ H : R : (2S, 3R).

Ans. (C) (a) S (b) 2S, 3S (c) 2S, 3R.

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