Starting with one mole of a compound `A`, it is found that the reaction is `3//4` completed in `1 hr`. Calculate the rate constant if the reaction is of
a. First order , b. Second order

Explanation

To solve the problem, we need to calculate the rate constant \( k \) for both first-order and second-order reactions given that the reaction is \( \frac{3}{4} \) completed in 1 hour, starting with 1 mole of compound \( A \).

### Step-by-Step Solution

#### Part (a): First Order Reaction

1. **Identify the Initial Concentration and Extent of Reaction**:
- Initial concentration of \( A \) (denoted as \( a \)) = 1 mole.
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