Chapter 20, Problem 20.42P

The stereochemistry of the products of reduction depends on the reagent used, as you learned in Sections 20.5 and 20.6. With this in mind, how would you convert $3,3$-dimethylbutan- $2$-one $\left[{\text{CH}}_{\text{3}}\text{CH}{\left({\text{CH}}_{\text{3}}\right)}_{\text{3}}\right]$ to: (a) racemic $3,3$-dimethylbutan- $2$-ol $\left[{\text{CH}}_{\text{3}}\text{CH}\left(\text{OH}\right)\text{C}{\left({\text{CH}}_{\text{3}}\right)}_{\text{3}}\right]$; (b) only (R)- $3,3$-dimethylbutan- $2$-ol; (c) only (S)- $3,3$-dimethylbutan- $2$-ol?