Which functional group isomer of carboxylic acids has the general molecular formula CₙH₂ₙO₂ and features an alkyl-oxygen ester linkage?

💡 Solution & Explanation

Esters share the general molecular formula $C_n H_{2n} O_2$ with carboxylic acids, serving as functional group isomers characterized by a carbonyl group bonded to an alkoxy fragment. Aldehydes possess the formula $C_n H_{2n} O$ and lack the second oxygen atom found in acids and esters. Ethers contain an oxygen atom linking two carbon chains without carbonyl functionalities. Ketones have the general formula $C_n H_{2n} O$ with a carbonyl carbon bonded to two hydrocarbon residues.