Question

what is the order of leaving group

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Answer 1

Good leaving groups are weak bases. They're happy and stable on their own. Some examples of weak bases: halide ions (I-, Br-, Cl-) water (OH2), and sulfonates such as p-toluenesulfonate (OTs) and methanesulfonate (OMs). The weaker the base, the better the leaving group.

Answer 2

The order of leaving groups is as follows :

Very weak bases are very good leaving groups .

For example : I- ions .

Then comes the weak bases which are fairly good leaving groups.

The strong bases are poor leaving groups .

Very strong bases are the poorest leaving groups .

Thus it basically depends on the basicity of the given compound.