The specific rotation of (S)−2 -iodobutane is +15.90°.
(a) Draw the structure of (S)−2 -iodobutane.
(b) Predict the specific rotation of (R)−2 -iodobutane.
(c) Determine the percentage composition of a mixture of (R)− and (S)−2 -iodobutane with a specific rotation of −7.95°.