Reaction Order

Chemistry Level 3

Assertion: The order of the reaction

CH X 3 − C O O C X 2 H X 5 ⟶ OH X − CH X 3 C O O H + C X 2 H X 5 O H \ce{{ CH }_{ 3 }-COO{ C }_{ 2 }{ H }_{ 5 }} \overset { \ce{ { OH }^{ - } }}{ \longrightarrow } \ce{ { CH }_{ 3 }COOH + { C }_{ 2 }{ H }_{ 5 }OH }

is 1 1 .

Reason: The order of a reaction is the sum of the powers of reactants in the rate expression.

Determine whether the assertion and/or reason are correct or not.

This is a part of my set Aniket's Chemistry Challenges . (BEST OF JEE - ADVANCED)
Both assertion and reason are correct and reason is the correct explanation of assertion Assertion is correct but Reason is false Both assertion and reason are incorrect Reason is correct but Assertion is false Both reason and assertion are correct but the reason is not the correct explanation of assertion

Aniket Sanghi by Aniket Sanghi , 21, India

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1 solution

Sujoy Ghosh
Mar 19, 2016

Basic hydrolysis of ester is 2nd order reaction,1st order wrt both the ester and the hydroxide ion.... Rate of reaction may depend upon the concentration of catalyst also(as in this case the hydroxide is also in rate law expression).....so both assertion and reason are incorrect

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Can u please elaborate why reason is incorrect?

Ashish R Nair - 5 years, 2 months ago

why hydrolysis of ester is 2 order reaction?

Mr Yovan - 4 years, 10 months ago

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Because hydroxide ion is also in the rate law. Its a Pseudo Bimolecular Reaction

Richeek Das - 2 years, 5 months ago

However, in this case hydroxide is no longer playing its role as a catalyst as it is incorporated into the product and thus, not regenerated. Hence, it can be considered as a reactant. Also, I believe that the reason is correct as it is defined as such.

Tan Yong Boon - 4 years, 5 months ago

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The time when I posted the q , I didn't notice what I really wrote , I wanted to write that it is sum of the coefficient of reactants. Never mind , I have changed the question now ! Thanks for telling!

Aniket Sanghi - 4 years, 4 months ago

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For a particular concentration of base , the reaction is a first order reaction and hence calling it a 2nd order reaction will not be correct. @Aniket Sanghi

Ankit Kumar Jain - 3 years, 6 months ago

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