Melting point
Chemistry
Level
2
Which has the higher melting point?
unsaturated fatty acid
polyunsaturated trans fatty acid
saturated fatty acid
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1 solution
In saturated(single bond) fatty acid , packing is more neatly done which maximize vanderwaal's attractions in saturated fatty acid. At number 2 will be polyunsaturated trans fatty acid bcoz they are more neatly packed as compared to other unsaturated(containing double bond) fatty acids bcoz double bond restricts rotation and therefore cause a kink in the chain which interferes with crystal packing , thereby lowering the melting point.