Predict the product and provide the mechanism for each reaction below.

When bromobenzene treated with Mg in dry yields phenyl magnesium bromide. But when treated with CO₂, will add nucleophile of Grignard reagent to carbonyl carbon. It leads to the production of intermediate compound which on hydrolysis with aqueous acid produces Benzoic acid.

The formation mechanism can be denoted as,

When 2-bromobutane treated with Mg in dry ether yields 2-butylmagnesium bromide. But when treated with CO₂, will add to nucleophile of Grignard reagent . It leads to the production of intermediate compound which on hydrolysis with aqueous acid yields Butanoic acid.

The reaction mechanism can be denoted as,

When Bromo cyclopropane treated with Mg in dry ether can yield the propyl magnesium bromide. But when treated with CO₂, will add to nucleophile of Grignard reagent of carbonyl carbon. It also leads to the production of intermediate compound which on hydrolysis with aqueous acid yields Cyclopropane carboxylic acid.

The reaction mechanism can be denoted as,