The molar mass of an organic acids is determined by____________?
Correct answer: B. Volumetric method
- A. Depression of freezing point
- B. Volumetric method
- C. Victor Meyer's method
- D. Osmosis method
Explanation
For a monobasic organic acid, volumetric analysis gives the amount of base required for neutralisation and can be used to calculate the acid's equivalent mass and molar mass. Victor Meyer's method is mainly used to determine the molar mass of volatile substances from their vapour volume, not specifically organic acids. The likely distractor is option c, which confuses a general vapour-density method with acid titration.
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About Reactivity of Carboxylic Acids
Carboxylic acids show acidic behaviour because their carboxylate ions are resonance-stabilised, and electron-withdrawing groups can change their strength. Reactions include neutralisation, esterification, formation of acid chlorides and amides, reduction, decarboxylation and substitution at the acyl carbon, which differs from the reactions of phenols.
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