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Question

Which isotope of hydrogen is used as a traces in organic reactions?

A
H
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B
D
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C
T
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D
All the above
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Solution

The correct option is B D
Hydrogen has three isotopes viz, H, D and T. Due to differences in masses, the rate constants of 3 isotopes with the same substrate are different in other words, both D and T show isotope effect. But since T is not only radioactive but is also least abundant hydrogen isotope. Therefore D is used as a traces to study the mechanism of organic reactions

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