Which among the following reactions is can be a example of pseudo first order reaction?

Options

A. Inversion of cane sugar
B. Decomposition of `H_(2)O_(2)`
C. Conversion of cyclopropane to propene
D. Decomposition of `N_(2)O_(5)`

Answer

To determine which of the given reactions can be an example of a pseudo-first-order reaction, we need to understand the characteristics of pseudo-first-order reactions.

### Step-by-Step Solution:

1. **Definition of Pseudo-First-Order Reaction**:
- A pseudo-first-order reaction is a bimolecular reaction that behaves like a first-order reaction because one of the reactants is present in a large excess. This means that the concentration of this reactant does not change significantly during the reaction, allowing us to treat it as a constant.

2. **Analyzing the Reactions**:
- We have four reactions to analyze:
- **A. Inversion of Cane Sugar (Hydrolysis of Sucrose)**:
- The reaction involves sucrose (C12H22O11) and water (H2O). In this case, water is typically present in large excess compared to sucrose. Therefore, the concentration of sucrose can be treated as the only variable affecting the rate, making this a pseudo-first-order reaction.
- **B. Decomposition of Hydrogen Peroxide (H2O2)**:
- The reaction is H2O2 → H2O + O2. The rate law is dependent only on H2O2, making it a first-order reaction, not pseudo-first-order.
- **C. Conversion of Cyclopropane to Propene**:
- The reaction involves cyclopropane converting to propene. The rate law depends solely on cyclopropane, which makes it a first-order reaction, not pseudo-first-order.
- **D. Decomposition of N2O5**:
- The reaction is N2O5 → N2O4 + NO2. The rate law depends only on N2O5, making it a first-order reaction, not pseudo-first-order.

3. **Conclusion**:
- Among the given reactions, only the **Inversion of Cane Sugar** (option A) can be classified as a pseudo-first-order reaction because water is in large excess, allowing us to simplify the rate law to depend only on the concentration of sucrose.

### Final Answer:
The reaction that can be an example of a pseudo-first-order reaction is **A. Inversion of Cane Sugar**.

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