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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 reagent is a polar molecule `overset(delta-)(R)-overset(delta+)(Mg)X`.
So, Grignard reagent are highly reactive and react with water (a good source of proton) to give hydrocarbons.
`RMgX+H_(2)OrarrRH+Mg(OH)X`
Hence, traces of moisture must be avoided during the use of a Grignard reagent.
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