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Most of haloalkanes and haloarenes react with certain metals to give compound containing carbon metal bonds called organometallic compounds. Grignard reagent is such organ magnesium compound. Grignard reagent can be prepared from halogen derivative of alkanes/arenes with magnesium metal in dry ether. These are highly reactive compounds and react with source of proton to give hydrocarbon. Grignard reagents undergo addition with carbonyl compounds to give corresponding alcohols.

The product (P) formed in the following reaction is