Questions: Select all that apply Which of the following options correctly describe fatty acids? Select all that apply. Double bonds in naturally occurring fatty acids usually have an E configuration. Saturated fatty acids contain no C=C double bonds in their chains. The melting point of a fatty acid decreases as the number of double bonds in the carbon chain increases. Naturally occurring fatty acids have carbon chains with 6-12 carbon atoms. All fatty acids contain a COOH group.

Solution Steps

1. Double bonds in naturally occurring fatty acids usually have an E configuration.

   • Naturally occurring fatty acids typically have double bonds in the cis (Z) configuration, not the E configuration.

2. Saturated fatty acids contain no $\mathrm{C}=\mathrm{C}$ double bonds in their chains.

   • This is correct. Saturated fatty acids do not have any double bonds in their carbon chains.

3. The melting point of a fatty acid decreases as the number of double bonds in the carbon chain increases.

   • This is correct. Double bonds introduce kinks in the fatty acid chain, preventing tight packing and thus lowering the melting point.

4. Naturally occurring fatty acids have carbon chains with $6-12$ carbon atoms.

   • This is incorrect. Naturally occurring fatty acids typically have longer carbon chains, often ranging from 14 to 22 carbon atoms.

5. All fatty acids contain a COOH group.

   • This is correct. Fatty acids are characterized by having a carboxyl (COOH) group at one end of the carbon chain.

Final Answer