A type of alcohol with molecular formula $\mathrm{C}_n\mathrm{H}_{2n+1}\mathrm{OH}$ contains one chiral carbon atom, but it does not react with hot, acidified $\mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7$. What is the lowest possible value of $n$?
- A5
- B6
- C7
- D8