Which of the following acids cannot be prepared directly from carboxylic acid?
Correct answer: B. Acid amide
- A. Acid halide
- B. Acid amide
- C. Ester
- D. Acid anhydride
Explanation
Acid amide cannot be prepared by the reaction of a carboxylic acid with ammonia. Carboxylic acids react with ammonia to form ammonium salts which on heating produce acid amides. CH3COOH + NH3 --> CH3COONH4 + H2O CH3COONH4 --> CH3CONH2
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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