Please explain what is this graph showing.HS= Homologous Series.

Dear Student,
In homologous series as the molecular mass increases a gradation in physical properties is seen. This is because the melting points and boiling points increase with increasing molecular mass. Other physical properties such as solubility in a particular solvent also show a similar gradation.
In first graph we can see that molecular mass is increasing.
And as the above explanation as molecular mass increase, the increase of boiling and melting point is also be seen (as shown in second graph) this is because of increasing intermolecular forces of attraction between molecules of increasing size.
And in the third graph we can see that the solubility decreases because solubility is not one single property, but a collection of related properties. Solubility in water is different from solubility in ethanol, which is different from solubility in benzene.
Regards

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