Phenylmagnesium bromide, C6H5MgBr, in dry ether is poured over solid CO2 and the product is then treated with dilute HCl. The organic product is

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Phenylmagnesium bromide, $C X_{6} H X_{5} MgBr$ , in dry ether is poured over solid $CO X_{2}$ and the product is then treated with dilute $HCl$ . The organic product is

The Grignard reagent adds to

CO X_{2}

to give the magnesium salt of a carboxylic acid,

C X_{6} H X_{5} COOMgBr

. Acidification liberates benzoic acid, which has one carbon more than the Grignard hydrocarbon part.