The reaction between hydroxide ion and chloromethane:

H-O -                 +           CH3 - Cl                  è           H-O-CH3                  +               Cl -

The reaction between hydrogen and bromine to give hydrogen bromide:

Initiation: the bromine molecule undergoes homolytic fission to two bromine atoms.

Propagation I: a bromine atom reacts with hydrogen molecule to give HBr and a hydrogen atom.

Propagation II: the hydrogen atom reacts with a bromine molecule to give HBr and a bromine atom.

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