Which one of the following compounds most radily undergoes substitution by `S_(N^(2))` mechanism?

Which one of the following compounds most readily undergoes substitution by S_(N^(2)) mechanism?

Which one of the following compounds most readily undergoes substitution by S_(N^(2)) mechanism?

Which one of the following compounds most readily undergoes substitution by S_(N)2 mechanism ?

Which one of the following compounds most readily undergoes substitution by S_(N)2 mechanism?

Which of the following compounds most readily undergoes solvolysis by S_(N)1 mechanism ?

Which of the following compounds most readily undergoes solvolysis by S_(N)1 mechanism-

Which of the following compound readily undergoes electrophilic substitution ?

Which on of the following compounds will undergo faster hydrolysis reaction by S_(N)1 mechanism ? Justify your answer.

Which one of the following compounds will undergo only S_(N)2 reaction-