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

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Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R).
\( \mathrm{P} \)
Assertion (A) : Heavy water is used for the study of
W reaction mechanism.
Reason (R) : The rate of reaction for the cleavage of \( \mathrm{O}-\mathrm{H} \) bond is slower than that of \( \mathrm{O}-\mathrm{D} \) bond.
[JEE Main-2021]
Choose the most appropriate answer from the options given below:
(a) Both (A) and (R) are true but (R) is not the true explanation of (A).
(b) Both (A) and (R) are true and (R) is the true explanation of (A).
(c) (A) is false but (R) is true.
(d) (A) is true but (R) is false
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