Halogenoalkanes react with hot ethanolic potassium cyanide.
The reaction mechanism is either ${S_N}1$or ${S_N}2$.
Which statement is correct?
1 )
All secondary halogenoalkanes react by the ${S_N}2$ mechanism only.
2 )
Both the halogenoalkane and the cyanide ion are involved in the initial step of the ${S_N}1$
mechanism.
3 )
Chloroethane reacts with cyanide ions by the ${S_N}1$ mechanism only.
The ${S_N}2$ mechanism involves a short-lived negatively charged transition state.
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