Synthesis of 2-Phenylcyclopentanone from cyclopentanol
Step 1 dehydrate cyclopentanol to cyclopentene with conc Sulfuric acid

Step 2 epoxidise cyclopentene with m- Chloroperbenzoic acid

Step 3 open the epoxide with phenyl grignard to give 2-phenyl cyclopentanol

Step 4 oxidise to required product