When (S)-2-bromobutane undergoes an S2N reaction with CH3O- , the product is the compound shown below.What is/are the configuration of the product(s) obtained from this reaction?
CH3CH2CHCH3
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OCH3
a. S only
b. R only
c. a mixure of enantiomers with more S than R
d. equal mixtures of R and S
e. a mixture of enantiomers with more R than S