JEE Main Chemistry question

Which of the following is **not** an example of a pseudo-unimolecular reaction? [BITSAT 2006]

(A)CH_3COOC_2H_5+H_2O\xrightarrow{H^+}CH_3COOH+C_2H_5OH
(B)
(C)CH_3COCl+H_2O\rightarrow CH_3COOH+HCl
(D)CH_3COOC_2H_5+H_2O\xrightarrow{OH^-}CH_3COOH+C_2H_5OHCorrect

Answer: (D)

Solution

In (A), (B) and (C), water is present in such large excess that its concentration stays effectively constant, so each reaction — though bimolecular in mechanism — experimentally follows first order (pseudo-unimolecular) kinetics. In (D), however, is consumed stoichiometrically along with the

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Question ID VK-144265