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Which of the following reactions is an example of a pseudo first-order reaction?

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in Chemistry – Class 12 by (188k points)
Which of the following reactions is an example of a pseudo first-order reaction?

(a) H2 + Br2 → 2HBr

(b) CH3CHO → CH4 + CO

(c) C12H22O11 + H2O → glucose + fructose

(d) PCl5 → PCl3 + Cl2

I got this question in an interview.

My query is from Chemical Kinetics in portion Chemical Kinetics of Chemistry – Class 12

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The correct answer is (c) C12H22O11 + H2O → glucose + fructose

Explanation: The order of the reaction may be sometimes altered sometimes by changing the conditions, for example, taking one or more reactants in excess compared to the other. The molecularity of inversion of cane sugar is 2 but follows first order kinetics because water is present in excess.

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