Which is the best leaving groupin a substitution reaction of analkyl h

1.	Which is the best leaving groupin a substitution reaction of analkyl halide?
Answer» <html><body><p>Very weak bases such as halide ions (I-, <a href="https://interviewquestions.tuteehub.com/tag/br-390993" style="font-weight:bold;" target="_blank" title="Click to know more about BR">BR</a>-, <a href="https://interviewquestions.tuteehub.com/tag/cl-408888" style="font-weight:bold;" target="_blank" title="Click to know more about CL">CL</a>-) water (<a href="https://interviewquestions.tuteehub.com/tag/oh2-2887293" style="font-weight:bold;" target="_blank" title="Click to know more about OH2">OH2</a>), and <a href="https://interviewquestions.tuteehub.com/tag/sulfonates-655340" style="font-weight:bold;" target="_blank" title="Click to know more about SULFONATES">SULFONATES</a> such as p-toluenesulfonate (OTs) and methanesulfonate (OMs) are excellent leaving groups. These are the conjugate bases of strong acids.Hope it helps :)</p></body></html>

Which is the best leaving groupin a substitution reaction of analkyl halide?