[" Which of the following is an "S_(N)2],[" reaction? "]

Which of the following does not show S_(N)2 reaction?

Which of the following is an example of S_N2 reaction?

Which of the following are S_(N^(2)) reactions?

Transition state is accompanied by the formation of which of the following species in S_(N^(2)) reaction ?

Which of the following is an example of S_(N^2) reaction ?