Halogenoalkanes undergo reaction with hot ethanolic potassium cyanide. The mechanism for this reaction is either $\text{S}_\text{N}1$ or $\text{S}_\text{N}2$. Which statement is true?
- AAll secondary halogenoalkanes react by the $\text{S}_\text{N}2$ mechanism only.
- BBoth the halogenoalkane and the cyanide ion are involved in the initial step of the $\text{S}_\text{N}1$ mechanism.
- CChloroethane reacts with cyanide ions by the $\text{S}_\text{N}1$ mechanism only.
- DThe $\text{S}_\text{N}2$ mechanism involves a short-lived negatively charged transition state.