1.

The SN_2 reactivity order for halides:

Answer»

`R-F GT R-d gt R-Br gt R-i`
`R-I gt R-Br gt R-Q gt R-F`
`R-Br gt R-I gt R-d gt R-F`
`R-Cl gt R-Br gt R-F gt R-I`

ANSWER :B


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