TS EAMCET · Chemistry · Chemical Kinetics

Which one of the following statements is correct for the reaction?

A Order is two but molecularity is one
B Order is one but molecularity is two
C Order is one but molecularity is one
D Order is two but molecularity is two

Verified Solution

Answer & Solution

Correct Answer

(D) Order is two but molecularity is two

Step-by-step Solution

Detailed explanation

For the reaction, \(\begin{aligned} & \mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5(a q)+\mathrm{NaOH}(a q) \longrightarrow \\ & \mathrm{CH}_3 \mathrm{COONa}(a q)+\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}(a q)\end{aligned}\) the molecularity is two because two molecules are taking…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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