Final answer:
Bromine cannot oxidize alcohols due to its weaker oxidizing properties compared to other halogens. The addition of a catalyst may enable the oxidation, but it is not a guarantee.
Step-by-step explanation:
Bromine cannot oxidize alcohols because it is a weaker oxidizing agent compared to other halogens like chlorine. The reactivity of bromine is less, which means it is less likely to undergo oxidation reactions. When propan-1-ol is mixed with bromine water, there is no reaction because bromine is not able to oxidize the alcohol.
If a catalyst is added, it may change the reaction. However, it is important to note that not all catalysts can enable the oxidation of alcohols by bromine. Some catalysts, such as acidic catalysts like sulfuric acid, can promote the oxidation of alcohols by bromine. But the addition of a catalyst does not guarantee a reaction will occur.