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NTA Abhyas NEET2020ChemistryBiomoleculesPractice

Palmitic and arachidonic acid have how many carbons excluding the carboxyl carbon?

Options

  1. A16,18
  2. B16, 20
  3. C15, 19
  4. D15,20

Correct answer

C. 15, 19

Step-by-step solution

Lipids are generally water-insoluble. They could be simple fatty acids. A fatty acid has a carboxyl group attached to an R group. The R group could be a methyl (–CH 3 ), or ethyl (–C 2 H 5 ) or a higher number of –CH 2 groups (1 carbon to 19 carbons). For example, palmitic acid has 16 carbons including carboxyl carbon. Arachidonic acid has 20 carbon atoms including the carboxyl carbon.

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