Give an example of second order reaction.

Explanation

### Step-by-Step Solution

1. **Understanding Second Order Reactions**:
A second order reaction is defined as a reaction where the rate depends on the concentration of two reactant molecules. This can be represented mathematically as:
\[ \text{Rate} = k[A]^2 \quad \text{or} \quad \text{Rate} = k[A][B] \]
where \( k \) is the rate constant, and \( [A] \) and \( [B] \) are the concentrations of the reactants.
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