Compound $P$ is refluxed with excess acidified potassium dichromate(VI) to produce compound $Q$. The boiling point of compound $Q$ is lower than that of compound $P$. What could be compound $P$?
- A2-methylbutan-1-ol
- B2-methylbutan-2-ol
- Cpentan-1-ol
- Dpentan-2-ol