Pseudo First Order Reaction MCQ - Practice Questions & Answers

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Pseudo Order Reaction

If one reactant is present in large excess a 2^nd order reaction is converted to 1^st order reaction. This is called a pseudo first order reaction.

acid catalysed hydrolysis of ester

$C_{3}H_{6}O_{2}+H_{2}O\rightarrow CH_{3}COOH+CH_{3}OH$

This reaction is first order with respect to ester. The 2nd order reaction with respect to that reactant which has been taken in more amount. For example:

$r=k[CH_{3}CO_{2}CH_{3}][H_{2}O]$ $=k^{'}[CH_{3}CO_{2}CH_{3}]$

$k[H_{2}O]=k^{'}$

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