Which of the following is wrong

Options

A. order of the reaction is negative, positive or fractional
B. order of the reactions is always equal to the sum of stoichiometric co-efficients
C. the order of a reactions may be zero
D. half life is independent of the concentration of reactants in first order reaction

Answer

To determine which statement is incorrect regarding the order of a reaction, let's analyze each statement one by one:

1. **Order of the reaction can be negative, positive, or fractional.**
- This statement is true. The order of a reaction can indeed be negative (in cases where the rate decreases with an increase in concentration), positive (where the rate increases with concentration), or fractional (in cases where the reaction involves intermediates or complex mechanisms).

2. **The order of a reaction is always equal to the sum of the stoichiometric coefficients.**
- This statement is false. The order of a reaction is determined by the rate law, which is based on the experimentally determined rate of reaction and does not necessarily equal the sum of the stoichiometric coefficients. The stoichiometric coefficients can provide insight, but they do not dictate the order.

3. **The order of a reaction can be zero.**
- This statement is true. A zero-order reaction means that the rate of reaction is constant and does not depend on the concentration of the reactants.

4. **Half-life is independent of the concentrations of reactants in first-order reactions.**
- This statement is true. In first-order reactions, the half-life is constant and does not depend on the concentration of the reactants.

### Conclusion:
The incorrect statement among the options provided is: **The order of a reaction is always equal to the sum of the stoichiometric coefficients.**

### Final Answer:
**The wrong statement is: The order of a reaction is always equal to the sum of the stoichiometric coefficients.**

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