Q.

Pure (S)-2-butanol has a specific rotation of +13.52 degrees. A sample of 2-butanol prepared in the lab and purified by distillation has a calculated specific rotation of +6.76  degrees. What can you conclude about the composition ?

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a

50% (S), 50% impurity

b

50% (S), 50% (R)

c

50% (S), 50% racemic

d

some other mixture

answer is C.

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Detailed Solution

Optical purity = optical rotation of mixtureOptical rotation of pure compound×100;           

 

  Optical Purity = 6.7613.52×100

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