The preparation of the reagents that will be made theoretically requires equivalent amounts of the organic halide and magnesium , but slightly Grignard reagent of the magnesium is normally used.
Explanation:
When the metal is binded to a carbon atom in an alkyl group a Grignard reagent is formed. An alkyl group contains a carbon and a hydrogen atom. Bromine and Iodine are the most common halogen atoms used during their reactivity. The magnesium is coated with a layer of magnesium oxide which inhibits reactions with the organic halide. The Grignard reaction is often used as a initiator.
The reaction starts with hydrocarbyl halide, based on organic history it is a big deal in the number of C - C bond forming reactions is very small, and Grignard reaction is the best and most effective reactions.
