When carboxylic acids and dicarboxylic acids have similar molecular weights, how do their melting points compare?
Correct answer: B. Dicarboxylic acids have greater melting points
- A. Carboxylic acids have greater melting points
- B. Dicarboxylic acids have greater melting points
- C. Both acids have similar melting points
- D. No consistent trends exits
Explanation
The presence of an additional carboxyl group (-COOH) in dicarboxylic acids leads to stronger intermolecular forces compared to carboxylic acids. The carboxyl groups in dicarboxylic acids can form stronger hydrogen bonding interactions, as there are two hydrogen bond acceptor sites in close proximity. This enhances the overall intermolecular forces and contributes to higher melting points. Carboxylic acids, on the other hand, have weaker intermolecular forces, due to the presence of only one carboxyl group. The hydrogen bonding interactions are comparatively weaker, resulting in lower melting points. Therefore, dicarboxylic acids have greater melting points when carboxylic and dicarboxylic acids have similar molecular weights.
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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