Question

5. (a) Draw the structure of (15.25,5R)-5-ethyl-2-isobutylcyclohexanol. Use solid and dashed wedges to show the proper configurations of the chiral centers. (0.4 pts) (b) Draw both chair conformations for this structure (0.4 pts) (c) Draw a box around the most stable chair conformation (0.2 pts) 6. Compounds A, B, and C are stereoisomers of 1,3-dimethylcyclopentane. Characterize the following solutions as optically active or optically inactive: (1) an equal mixture of B and C and (2) an equal mixture of A and B. Circle the true statement below. (0.2 pts) (a) Both mixtures 1 and 2 are optically active. (b) Mixture 1 is optically inactive, mixture 2 is optically active. (c) Mixture 1 is optically active; mixture 2 is optically inactive. (d) Both mixtures 1 and 2 are optically inactive. 7. Classify each reaction as oxidation, reduction, or neither. (0.3 pts) CH3CH2OH + CH3CHO classification = classification - CH=CH - CH:CH OH classification

Answer 1

Α 5R)-5-ethyl-2-isobutlleyclohexanol. OH Shah OH HA AUD AHOR done. So, 15, 25, 5R is

6 The chair conformation for this structure is. to th OF) . 6 con formation is most stable as the larse isobutyl and ethyl groups are in equatorial position, so less interaction. 1 But in @ significant 1,3-diaxial interaction happens making its less Stable moh KI HYH - HH

. so, most stable con formation is