Question

Activation energy for the hydrolysis of sucrose by acid is X kJ mol$^{-1}$ and by sucrase is Y kJ mol$^{-1}$. X and Y respectively are

• A. 6.22, 2.15
• B. 2.15, 6.22
• C. 6.22, 6.22
• D. 2.15, 2.15

Hint:

Enzymes lower the activation energy of biochemical reactions significantly compared to acids or chemical catalysts.

Answer 1

The Correct Option is A

Hydrolysis of sucrose by acid is a non-enzymatic reaction and thus has a higher activation energy (X = 6.22 kJ/mol).
When catalyzed by enzyme sucrase, the activation energy is significantly reduced (Y = 2.15 kJ/mol).
This demonstrates the catalytic efficiency of enzymes.