Destroyer Bio Q34

[hannah999]

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Answer B states: A sample with higher adenine-thymine ratio will melt lower than one with guanine-cytosine.

According to the book, this answer choice is true, but I thought since adenine-thymine has only 2 hydrogen bonds compared to guanine-cytosine, it will have a lower boiling point and higher melting point.

Is it always true that if a sample has a higher boiling point, it will also have a lower melting point (they are opposite)?

Thanks!

 

[hannah999]

can someone please explain this to me.
thanks

 

[klutzy1987]

Hydrogen bonding increase meting and boiling points, because they increase intermolecular forces which cause something to prefer its solid form. The higher the boiling and melting points, the easier it is to become solid.