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Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reactions. Reason R: Isotopes of hydrogen have different enthalpy of bond dissociation. In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both A and R are correct but R is NOT the correct explanation of A
2. Both A and R are correct and R is the correct explanation of A
3. A is not correct but R is correct
4. A is correct but R is not correct

Correct answer: Both A and R are correct and R is the correct explanation of A

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