Halogens are good leaving groups in substitution reactions because leaving group ability is directly related to their being: a. weak bases
b. strong bases
c. strong acids
d. electrophiles

weak bases

Explanation:

Leaving groups accept electron pairs. A strong base donates an electron pair while a weak base accepts an electron pair.

Since good leaving groups must readily accept electrons, weak bases are very good leaving groups.

The order of usefulness of halogens as leaving groups is: I > Br > Cl > F

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