Phenylmagnesium bromide in ether is treated with solid CO2 and then with H3O+. The product is

JEE Main levelSingle correct optionDifficulty 2 of 3o1125

Phenylmagnesium bromide in ether is treated with solid $CO X_{2}$ and then with $H X_{3} O X^{+}$ . The product is

The carbanion-like carbon of

C X_{6} H X_{5} MgBr

attacks the carbon of

CO X_{2}

to give

C X_{6} H X_{5} COOMgBr

, and acidification gives

C X_{6} H X_{5} COOH

. The carbon count increases by one and the product is a carboxylic acid, not an aldehyde or alcohol.