Give an example of a reaction having fractional order.

Explanation

To solve the question of providing an example of a reaction with fractional order, we can follow these steps:

### Step 1: Understand the Concept of Reaction Order
The order of a reaction is defined as the sum of the powers of the concentration terms in the rate law expression. It can be a whole number, zero, or a fraction.

### Step 2: Identify a Suitable Reaction
One well-known example of a reaction that exhibits fractional order is the reaction between hydrogen gas (H₂) and bromine gas (Br₂) to form hydrogen bromide (HBr).

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