Monounsaturated fats have one double bond between two carbon atoms
Polyunsaturated fats have a larger number of double bonds between carbon atoms
A double bond causes a kink in the hydrocarbon chain, the kinks stop the chains packing together closely.
The intermolecular bonds between unsaturated triglycerides are weak which means that unsaturated fats are liquid at room temperature e.g. vegetable oils
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