1.

Reactivity of order of halides for dehydrohalogenation is

Answer»

`R-F gtR- Cl gt R - Br gt R -I`
`R-I gt R - Br gt R - Cl gt R- F`
`R- I gt R - Cl gt R - Br gt R- F`
`R- F gt R - I gt R - Br gt R - Cl`

Solution :As the SIZE of halide ion increases the R-X BONDS strength DECREASES and the halide ion will be a good leaving group.
THUS, the reactivity order is `R- I gt R - Br gt R - Cl gt R - F`.


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