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  4. Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester. If the reaction is carried out with large excess of ester, the order with respect to ester will be

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Q. Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester. If the reaction is carried out with large excess of ester, the order with respect to ester will be

WBJEEWBJEE 2013Chemical Kinetics

Solution:

$CH_{2}COOC_{2}H_{5}+H_{2}O \rightleftharpoons CH_{3} COOH +C_{2} H_{5}OH$
If above reaction is carried out with large excess of ester, the rate of reaction does not depend upon cencentration of both the reactants. Due to which, the reaction becomes of zero order