Before you start the Grignard reaction you will need to exchange your glassware (cleaned) for dry glassware from the oven, it is because water functions as an acid, and would cleave the Grignard reagent producing benzene, that's why you must keep your reaction apparatus, reagents, and all kind of glassware completely dry.
Grignard reaction is an organometallic chemical reaction in which alkyl, allyl, vinyl or aryl-magnesium (Grignard reagent) are added to the carbonyl group in aldehyde or ketone.
Grignard reaction can be described by the chemical formula,
'R-Mg-X', where R refers to an alkyl or allyl group,
Mg refers to Magnesium, and,
X refers to a halogen.
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