Hydrogen has three isotopes – Protium (1H1), Deuterium (2H1), Tritium (3H1). The number of neutrons is the reason why these isotopes differ from each other in spite of having the same atomic number.
Among these isotopes, only deuterium has one proton and one neutron in its nucleus. When deuterium reacts with oxygen, deuterium oxide which is heavy water (D2O), is produced.
The D – D bond is stronger than H - H bond, therefore, H2 is more reactive than D2 towards reaction with oxygen. So, they would not have the same reactivity.
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Knowing the propeNCERT - Chemistry Part-II