Which of the Following Statements Explain Why Aryl Halides and Vinyl

question 56

Multiple Choice

Which of the following statements explain why aryl halides and vinyl halides do not undergo nucleophilic substitution by either the S_N1 or S_N2 mechanism?

• A)They don't undergo S_N1 reactions because a higher percent s-character makes the bond longer and stronger.
• B)They don't undergo S_N2 reactions because a higher percent s-character makes the bond shorter and stronger.
• C)They don't undergo S_N2 reactions because heterolysis of the C-X bond forms a highly unstable carbocation.
• D)They don't undergo S_N1 reactions because the carbocation is highly electronegative.