Question: Which of the following is pseudo first order reaction?
A CH3COOC2H5+H2O —> CH3COOH+ C2H5OH
B C12H22O11+H2O —> C6H12O6+ C6H12O6
C Both of these
D None of these
Answer: Both of these
| Aspect | Description |
| Introduction | Pseudo-first order reactions are those where the rate of the reaction is primarily determined by the concentration of one reactant, which is typically present in a large excess compared to the other reactants. |
| Rate Expression | Rate = k[A]
[A] = Concentration of the reactant that determines the rate. |
| Determining Factor | Concentration of one reactant (usually [A]) primarily determines the rate and its concentration remains relatively constant during the reaction. |
| Reaction Order | Pseudo-first order reactions have an apparent reaction order of 1 with respect to the reactant that determines the rate. |
| Example | · The hydrolysis of esters in the presence of excess water and acid.
· The concentration of water is often in large excess, making it the determining factor for the rate. |