Select the correct statements about Grignard reagents $R - MgX$ .

AA Grignard reagent can be safely prepared with methanol as the solvent.
B $CH X_{3} CH X_{2} I$ forms a Grignard reagent more readily than $CH X_{3} CH X_{2} Cl$ .
CThe carbon attached to magnesium carries a partial negative charge.
DDiethyl ether stabilises the reagent by donating oxygen lone pairs to magnesium.

Answer: B, C, D

Iodides react fastest because of the weaker C-I bond; ether oxygen lone pairs solvate Mg; the C-Mg bond is polarised towards carbon. Methanol has an acidic O-H and would destroy the reagent.

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Select the correct statements about Grignard reagents R−MgX.

Answer: B, C, D

More questions on Organometallic reagents: Grignard and organolithium

Select the correct statements about Grignard reagents $R - MgX$ .