Let us say that the (2R,3R) and (2S,3R) products in eq. 5.7 are formed in a 60:40 ratio. What products would be formed and in what ratio by adding HBr to pure (S)-3-chloro-1-butene? By adding HBr to a racemic mixture of (R)- and (S)-3-chloro-1-butene?

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CH3 CH3 CH3 HBr C H CH H-B (5.7) CH2 CH CH3 (R)-3-chloro-1-butene 2R,3R)2-bromo-3-chlorobutane (25,3R)-2-bromo-3-chlorobutane