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Rate of reaction -1/5 d[Br^-]/dt = +1/3 d[Br2]/dt

1. Rate of reaction is proportional to Br^-.
2. Rate of reaction is proportional to Br2.
3. Rate of reaction is proportional to the concentration of reactants.
4. Rate of reaction is proportional to the concentration of products.

Correct answer: Rate of reaction is proportional to the concentration of reactants.

Solution

The rate of reaction is determined by the concentration of reactants, as it is directly proportional to the rate of disappearance of reactants like Br⁻ in this case.

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