00:01
High melting point of any substance is the temperature at which the solid starts converting into a liquid form.
00:08
Now the melting point depends upon the energy.
00:13
It takes to overcome the forces holding the molecules in a retus.
00:19
So if there are stronger intermolecular forces of attraction between the molecules, then that substance would have a higher melting point.
00:27
And if there are weaker intermolecular forces of attraction, then that substance will have a lower melting point.
00:36
Melting point also depends on the geometry of the molecule, that is how they are packed.
00:42
The saturated molecules or the saturated fatty acids are uniform and thus they nicely form a lattice and they are tightly packed due to their uniform structure.
00:53
That is why they have higher melting points.
00:56
Then the unsaturated fatty acids.
01:00
Therefore, we can say that saturated fatty acids have higher melting point due to the stronger forces of attraction between its molecules.
01:09
Now, the second part is asking about the role of double bonds.
01:15
Double bond caused the hydrocarbon chains to bend.
01:18
This results in decrease of the wonderful forces of attraction between the fatty acid molecules.
01:28
Making it easier to escape which means the melting point is decreased.
01:34
Now the general representation of fatty acid is first we write the number of carbon atoms, then number of double bonds followed by a sign of triangle that represents the location of double bonds...