H/Pt C-C TThis is a reduction reaction and it also can be called as an addition reaction B 2 C-C Br Br TThis is an addition reaction but in fact it can be conidered as an oxidation reactionC C H2 / Pt C C H H This is a reduction reaction, and it also can be called as an addition reaction C C Br2 C C B r B r This is an addition reaction, but in fact, it can be conidered as an oxidation reaction