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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
Question
Explain why,
Grignard reagents should be prepared under anhydrous conditions?
✓

Answer

Grignard reagents are very reactive. In the presence of moisture, they react to give alkanes.
$\stackrel{\delta-}{\hbox{R}}\ \stackrel{\delta+}{\hbox{Mg}}\ \stackrel{\delta-}{\hbox{X}}+\text{H}_2\text{O}\rightarrow\text{R}-\text{H}+\text{Mg(OH)X}\\ \text{Grigrard reagent}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Alkane}$
Therefore, Grignard reagents should be prepared under anhydrous conditions.

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