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» Very weak bases such as halide ions (I-, BR-, CL-) water (OH2), and SULFONATES such as p-toluenesulfonate (OTs) and methanesulfonate (OMs) are excellent leaving groups. These are the conjugate bases of strong acids.Hope it helps :)

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