AP EAMCET202316 May 2023Evening ShiftChemistryHaloalkanes and HaloarenesActual
Which of the following alkyl halide is most reactive towards substitution by S _ N 1 mechanism?
Options
- A( CH ₃ )₃ C - Br
- B( CH ₃ )₃ C - I
- C( CH ₃ )₃ C - F
- D( CH ₃ )₃ C - Cl
Correct answer
B. ( CH ₃ )₃ C - I
Step-by-step solution
An S _ N 1 reaction involves two steps; formation of carbocation (which is the slow and thus, the rate-determining) and attack of the nucleophile on the - carbon. Among the given options, the C - X bond is weakest for C - I in ( CH ₃ )₃ C - I . Thus, it will be most reactive towards S _ N 1 reaction.