The effectiveness of a catalyst in the hydrogenation of ethene can be measured by evaluating the following parameters:1. Reaction rate: The rate at which the reaction proceeds is a key indicator of the effectiveness of a catalyst. A more effective catalyst will increase the reaction rate, leading to faster conversion of ethene to ethane. This can be measured by monitoring the decrease in ethene concentration or the increase in ethane concentration over time.2. Turnover frequency TOF : Turnover frequency is the number of catalytic cycles a catalyst can perform per unit time. It is an important measure of the catalyst's efficiency. A higher TOF indicates a more effective catalyst. TOF can be calculated by dividing the reaction rate by the amount of catalyst used.3. Activation energy: The activation energy is the minimum energy required for the reaction to occur. A more effective catalyst will lower the activation energy, making it easier for the reaction to proceed. This can be determined experimentally by measuring the reaction rate at different temperatures and using the Arrhenius equation.4. Selectivity: An effective catalyst should selectively promote the desired reaction hydrogenation of ethene without causing unwanted side reactions. The selectivity of a catalyst can be determined by analyzing the product mixture and calculating the ratio of the desired product ethane to any undesired products formed.5. Stability and recyclability: A good catalyst should be stable under the reaction conditions and maintain its activity over multiple reaction cycles. The stability and recyclability of a catalyst can be assessed by performing multiple reaction cycles and measuring the catalyst's activity and selectivity in each cycle.To measure the effectiveness of a catalyst in the hydrogenation of ethene, you can perform experiments using different catalysts and compare their performance based on the parameters mentioned above. The catalyst that shows the highest reaction rate, turnover frequency, selectivity, and stability would be considered the most effective for the hydrogenation of ethene.