Which is the best leaving group? a) I- b) Br- c) Cl- d) F
Which is the best leaving group? a) I- b) Br- c) Cl- d) F
Explanation
Leaving group ability:
A good leaving group is a species that can easily depart from a molecule taking a pair of electrons with it.
Halide trend:
Among halogens (I, Br, Cl, F), iodide (I-) is the best-leaving group because it is the weakest base, meaning it is most stable with a negative charge.