State the meaning of the term rancidity as it applies to fats.

Compare the two rancidity processes.

Hydrolytic process:

Oxidative process:

unpleasant/disagreeable smell/taste/texture/appearance;

Hydrolytic process:

lipid converted into glycerol and fatty acid (by hydrolysis of water in presence of enzymes and no C=C present);

Oxidative process:

oxidation of unsaturated fatty acid (chains)/addition of oxygen across C=C/carbon-carbon double bond;

The vast majority of candidates answered correctly.

(b) (i) was poorly answered by the vast majority with only very few candidates scoring some marks here.