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Question relating to Optical Activity

1. Given that (R)-2-bromobutane has a specific rotation of -23.1o , what is the specific rotation of (S)-2-bromobutane  ?
 

2.  Using the data from Qu1, what is the optical purity and % composition of a mixture of (R)- and (S)-2-bromobutane whose specific rotation was found to be +18.4o ?

3.  What about a mixture whose specific rotation was found to be - 9.2o ?

Answer.....