Question

Assertion: Order and molecularity are the same.

Reason: Order is determined experimentally, and molecularity is the sum of the stoichiometric coefficients of the rate-determining elementary step.

• A. Assertion is correct but reason is incorrect.
• B. Assertion is incorrect but reason is correct.
• C. Both assertion and reason are correct but reason does not explain assertion.
• D. Both assertion and reason are correct and the reason is correct explanation of assertion.
• E. Both assertion and reason are incorrect.

Answer 1

The correct option is B

Assertion is incorrect but reason is correct.

Analysing the assertion

The order and the molecularity of a reaction may or may not be the same, as the order of a reaction is determined experimentally. They are equal for elementary one-step reactions, but for complex reactions, they may be different.

So, the assertion is an incorrect statement.

Analysing the reason

Only for elementary reactions, the order and the molecularity can be the same. For complex reactions, they may be different.

Order is determined experimentally, and molecularity is the sum of the stoichiometric coefficients of the rate-determining elementary step.

So, the reason is a correct statement.

Thus, the assertion is an incorrect statement, but the reason is a correct statement.

Hence, the correct answer is option $\left(E\right).$