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A typical sample of (R) and (S)-lactic acid shows
\( \mathrm{P} \)
optical rotation \( +12.1^{\circ} \). The optical rotation of pure
W
(R)-lactic acid is \( -13.5^{\circ} \). The percentage of (R) and
(S) lactic acid present in the sample is:
(1) \( \mathrm{R}=81 \%, \mathrm{~S}=19 \% \)
(2) \( \mathrm{R}=90 \%, \mathrm{~S}=10 \% \)
(3) \( \mathrm{R}=5 \%, \mathrm{~S}=95 \% \)
(4) \( \mathrm{R}=95 \%, \mathrm{~S}=5 \% \)
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