Question

Assertion :The acid hydrolysis of ester takes place more rapidly in $D_{2}O$ than $H_{2}O$. Reason: $D_3{O}^{+}$ is stronger acid than $H_3{O}^{+}$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Water ($H_{2}O$) is a better solvating agent for $H_3{O}^{+}$ than $D_{2}O$ for $D_3{O}^{+}$ because it forms stronger H-bonds due to the greater O-H vibration frequency.

So, $D_3{O}^{+}$ in $D_{2}O$ is a stronger acid than $H_3{O}^{+}$ in $H_{2}O$ and acid hydrolysis of ester takes place rapidly in $D_{2}O$ than $H_{2}O$.