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JEE Main 202126 AugustEvening Shift
Exam
JEE Main
Year
2021
Date
26 August
Shift
Evening Shift
Subject
Chemistry
Chapter
Hydrogen

JEE Main 2021 · 26 August · Evening Shift · Chemistry · Hydrogen

Given below are two statements : one is labelled as Assertion (A)...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Heavy water is used for the study of reaction mechanism.
Reason (R): The rate of reaction for the cleavage of O−HO - H bond is slower than that of O−DO - D bond.
Choose the most appropriate answer from the options given below :

Options

  1. ABoth (A)( A ) and (R)( R ) are true and (R)( R ) is the true explanation of (A)( A ).
  2. B(A)( A ) is true but (R)( R ) is false.
  3. C(A)( A ) is false but (R)( R ) is true.
  4. DBoth (A)( A ) and (R)( R ) are true but (R)( R ) is not the true explanation of (A).( A ) .

Correct answer

B. (A)( A ) is true but (R)( R ) is false.

Step-by-step solution

Statement-1:1: D2O{D}_{2}O is used as a moderator in nuclear reactor and in exchange reactions for the study of reaction mechanisms.
Statement-2:2: Bond energy of O−H<O - H < Bond energy of O−DO - D.
So rate of reaction of cleavage of O-H bond is faster than that of O-D bond.
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