D2O+mgbr reaction?

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Can someone explain this reaction for me? I saw the key but it doesn't explain what is going on.

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Br2 in light will go to the most stable radical (tertiary). Then Mg and ether will make Grignard (MgBr). Grignard is a carbanion and also a very strong base. So by adding D2O, carbanion will receive D.

The answer is B.
D is Deuterium, it is an isotope, or the heavier form of Hydrogen. When you add water to Grignard, carbanion gets protonated, meaning when yo react it with water you add an H to the carbanon.
Here, instead of adding an H to the carbanon, we add D.

Hope this helps.
 
Br2 in light will go to the most stable radical (tertiary). Then Mg and ether will make Grignard (MgBr). Grignard is a carbanion and also a very strong base. So by adding D2O, carbanion will receive D.

The answer is B.
D is Deuterium, it is an isotope, or the heavier form of Hydrogen. When you add water to Grignard, carbanion gets protonated, meaning when yo react it with water you add an H to the carbanon.
Here, instead of adding an H to the carbanon, we add D.

Hope this helps.
Got it thank you!
 
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When the last step in a series of reactions is H2O (or D2O) or H3O+, you should think protonation!
 
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