Moderate

Rancid butter has the smell due to:

Correct answer: A. Butanoic acid

  • A. Butanoic acid
  • B. Propanoic acid
  • C. Ethanoic acid
  • D. Methanoic acid

Explanation

Rancid butter typically has a smell due to the presence of butanoic acid, also known as butyric acid. This compound is responsible for the characteristic unpleasant odor often associated with rancid butter.

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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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