What are Kolbe’s Reaction ? Give one example.

Explanation

Complex reactions are those which involve more than one steps. For example, consider the reaction,
`4 H Br + O _(2) to 2 H _(2) O + 2 Br _(2)`
Followign are the elementary reactions of above reactions:
`4 HBr + O _(2) to overset( "Slow")to HOOBr `
`HOOBr + HBr to 2 H Br O `
`(HBr + HBr O to H _(2) O + Br _(2) xx 2 )/( 4 H Br + O _(2) to 2 H _(2) O + 2 Br _(2))` [Overall reaction]
Among different elementary reactions, the slowest step is the reaction detrmining step Rate `= k [HBr] [O _(2)].`