Question

Please answer all components.

Postlab 1) Coconut oil ls omprised of a misture of fatty acids in the form of triglycerides. The most abundant fatty acids in coconut oil are as follows: Lauric acid (48%) oleic acid (6.5%) Myrisitic acid (16%) Palmitic acid (9.5%) Draw the structure of each of these fatty acids: Considering the structures above, explain the relatively high melting point of coconut oll 2) Some oils that are improperly stored (exposed to oxygen) over long periods of time can go rancid, due to auto oxidation at the allylic position. Draw the radical mechanism of the following oxidation reaction, and label the initiation, propagation, and termination steps. 3) OH

Answer 1

1) Answer

Lauric acid

Laueic acid -o-C-C-C-C-C-と-C-C-と-と-C-C-W Laueic acid

Myrisitic acid -

Oleic acid2.by considering above structures the coconut oil has high melting point because ,it contains lauric acid 48% and palmitic acid 9.5% i.e.total of 57.5 % of saturated fatty acids.

OH

It contains myristic acid 16 % and oleic acid 6.5% i.e.total of 22.5% unsaturated fatty acids,because myristic and oleic are unsaturated.

The melting point of saturated fatty acids is higher than that of unsaturated fatty acid.

Coconut oil contains higher amount of saturated fatty acid therefore have high melting point.