The reactivity of halogen acids with ether follos the order `:`

Reactivity of halogen acids towards ethers follows the sequence : HI gt HBr gt HCl

The order of reactivity of halogens with methane is

Reactivity of acids in esterification follows the order .

In the elimination of reactions, that is, in the formation of alkenes, the reactivity of halogens in alkyl halides in the the order-