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Why is it necessary to avoid even traces...

Why is it necessary to avoid even traces of moisture during the use of a Grignard reagent?

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Grignard reagents are very susceptible to reaction with compounds containing active hydrogen. Thus they react very rapidly with `H_(2)O` (moisture) to give the corresponding alkane.
`underset("Alkane")(R-MgX+H-OH rarr R-H+Mg(X)OH)`
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