Identify the oxidants and redutants in the folowing reactions
`(a) CH_(4)(g)+4CI(g)rarrCCI_(4)(g)+4HCI(g)`
`(b)2H^(+)(aq)+MnO_(2)(S)+C_(2)H_(2)O_(4)(aq)rarrMn^(2+)(aq)+2CO_(2)(g)+2H_(2)O(l)`
`(c )I_(2)(aq)+2S_(2)O_(3)^(2-)(aq)rarr2I^(-)(aq)+S_(4)O_(6)^(2-)(aq)`
`(d) CI_(2)(g)+2Br^(-)(aq)rarr2CI^(-)(aq)+Br_(2)(aq)`

Explanation

Let us wirte the oxidation numbers of all the atoms of the reactants and products taking part in the reaction

`CH_(4)` is redutant (redcuing agent ) and `CI_(2)` is oxidant (oxidising agent).
Let us wirte the oxidation numbers of all the soms of the reactants and products taking part in the reaction

`C_(2)H_(2)O_(4)` is redcutant (reducing agent ) and `MnO_(2)` is oxidant (oxidising agent)
Let us write the oxidation numbers of all the atoms of the rectants and products taking part in the reaction

`S_(2)O_(3)^(2-)` is reducatant (redcuing agent) and `I_(2)` is oxidatn (oxidising agent)
Let us write the oxidation numbers of atoms of all the reactants and products takiong part in the reaction

`Br^(-)` is reducatant (reducing agent) and `CI_(2)` is oxidatn (oxidising agent).