State a condition under which a bimolecular reaction is kinetically first order reaction.
(N/A) bimolecular reaction becomes a first-order reaction when one of the reactants is present in large excess.
For example,the hydrolysis of ethyl acetate:
$CH_{3}COOC_{2}H_{5} + H_{2}O \rightarrow CH_{3}COOH + C_{2}H_{5}OH$
In this reaction,water is taken in large excess,so its concentration remains effectively constant throughout the reaction.
Thus,the rate law becomes:
$Rate = k[CH_{3}COOC_{2}H_{5}]^{1}[H_{2}O]^{0} = k'[CH_{3}COOC_{2}H_{5}]$
Therefore,the reaction behaves as a first-order reaction,also known as a pseudo-first-order reaction.
For example,the hydrolysis of ethyl acetate:
$CH_{3}COOC_{2}H_{5} + H_{2}O \rightarrow CH_{3}COOH + C_{2}H_{5}OH$
In this reaction,water is taken in large excess,so its concentration remains effectively constant throughout the reaction.
Thus,the rate law becomes:
$Rate = k[CH_{3}COOC_{2}H_{5}]^{1}[H_{2}O]^{0} = k'[CH_{3}COOC_{2}H_{5}]$
Therefore,the reaction behaves as a first-order reaction,also known as a pseudo-first-order reaction.
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$(a)$ $2.1 \times 10^{-2} \ mol \ L^{-1} \ s^{-1}$
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Reason : The rate of the reaction does not depend upon the concentration of $C$.
DifficultAIIMS 2017
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