What reagent would be most suitable for telling cyclohexene from cyclohexanol?
- A$\text{Ag(NH}_3)_2^+$ in $\text{H}_2\text{O}$
- B$\text{Br}_2$ in $\text{CCl}_4$
- C2,4-dinitrophenylhydrazine in $\text{CH}_3\text{OH}$
- D$\text{NaBH}_4$ in $\text{CH}_3\text{OH}$