Assertion :Hydrolysis of ethyl acetate in presence of acid is a reaction of first order whereas in presence of alkali, it is a reaction of second order. Reason: Acid acts as catalyst only whereas alkali acts as one of the reactant.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion

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Assertion is correct, but Reason is incorrect

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Assertion is incorrect, but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In reaction with acid, the rate determining step is decomposition of protonated ester. Here, the acid is regenrated and thus rate does not depend on concentration of acid as it remains constant. Hence the reaction is 1st order.
In reaction with base, the rate determining step is formation of adduct of base and ester. Here, the base consumed and the rate depends on its concentration. hence the reaction is second order.
Acid thus acts as catalyst, but alkali acts as a reactant.

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Similar questions

Q. Assertion :Hydrolysis of ethyl acetate in the presence of acid is a reaction of first order whereas in the presence of alkali, it is a reaction of second order. Reason: Acid acts as catalyst only, whereas alkali act as one of the reactant.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
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(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Reason (R) Lewis acid polarises the bromine molecule.
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(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Reason (R) We cannot determine order from balanced chemical equation.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
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