Alcohol Phenols And Ethers

$\text{C}_3\text{H}_6 \xrightarrow{\large{(i)\text{ BH}_3;\ (ii)\text{ H}_2\text{O}_2/\text{NaOH}}} P \xrightarrow{\large{\text{CrO}_3,\text{ anhydrous medium}}} Q \xrightarrow{\large{(i)\text{ CH}_3\text{MgBr};\ (ii)\text{ H}_2\text{O}}} R + \text{Mg(OH)Br}$
The organic compounds $P, Q$ and $R$ are