Show how the following transformations may be accomplished in good yield. You may use any additional reagents that are needed.
(a) bromobenzene $\rightarrow$ propiophenone
(b) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CN} \rightarrow 3$ -heptanone
(c) benzoic acid $\rightarrow$ phenyl cyclopentyl ketone