A compound Y, $\text{C}_4\text{H}_9\text{Br}$, is hydrolysed in aqueous alkali to give an alcohol, $\text{C}_4\text{H}_9\text{OH}$. It is observed that the reaction rate does not change when the concentration of $\text{OH}^-$ ions present is varied. Which molecular structure of Y is most likely?
- A$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{Br}$
- B$\text{CH}_3\text{CH}_2\text{CHBr}\text{CH}_3$
- C$ (\text{CH}_3)_2\text{CHCH}_2\text{Br}$
- D$ (\text{CH}_3)_3\text{CBr}$