Problem: Arrange the following fatty acids from highest melting point to lowest melting point. CH3(CH2)12COOHCH3(CH2)16COOHCH3CH2 (CH=CHCH2)3(CH2)6COOHCH3(CH2)5CH=CH(CH2)7COOHSelect all of the statements about fatty acid melting points that are true. a) A saturated fatty acid with a greater molar mass has a higher melting point than a saturated fatty acid with a lower molar mass. b) A saturated fatty acid with a greater molar mass has a lower melting point than a saturated fatty acid with a lower molar mass. c) A saturated fatty acid has a higher melting point than an unsaturated fatty acid. d) A saturated fatty acid has a lower melting point than an unsaturated fatty acid.

FREE Expert Solution

For this problem, we are being asked to arrange the following fatty acids to increasing melting point:

CH3(CH2)12COOH, CH3(CH2)16COOH, CH3CH2 (CH=CHCH2)3(CH2)6COOH, CH3(CH2)5CH=CH(CH2)7COOH


  • We will be considering two factors to determine which fatty acid will have a higher MP:

(1) Molar mass or number of Cs

(2) Presence of double bond

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Problem Details

Arrange the following fatty acids from highest melting point to lowest melting point. 

CH3(CH2)12COOH

CH3(CH2)16COOH

CH3CH2 (CH=CHCH2)3(CH2)6COOH

CH3(CH2)5CH=CH(CH2)7COOH

Select all of the statements about fatty acid melting points that are true. 

a) A saturated fatty acid with a greater molar mass has a higher melting point than a saturated fatty acid with a lower molar mass. 

b) A saturated fatty acid with a greater molar mass has a lower melting point than a saturated fatty acid with a lower molar mass. 

c) A saturated fatty acid has a higher melting point than an unsaturated fatty acid. 

d) A saturated fatty acid has a lower melting point than an unsaturated fatty acid.

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