2. Intermolecular forces olecular forces, and t the whole story. The boiling poi

Question

2. Intermolecular forces olecular forces, and t the whole story. The boiling point thus high r in termo boiling points and melting points. Of course, that's no also depends on which inter boiling points and meltgot the whole story. The boiling point molecular forces are present in a specific compound. dipole-dipole interactions hydrogen bonding Look up the comp and boiling points, then answer the other questions. London "dispersion" forces ree compounds shown in the following table. Fill in their molecular masses Structur re Molecular Boiling Which Intermolecular Force is Mass g/mol Point strongest for this molecule? Name band Butyric H-C-c-C-C acid 4-butyro C-CH 6.009/ lactone Lond an Which compound has the strongest intermolecular forces? How can you tell? 4-hMy.ro lactone,-The Doiling ptti, higher so re Which compound has the weakest intermolecular forces? How can y ou tell? UXA he The brenlc the lnd

Explanation / Answer

First, we talk about how a bond is internally strong and effect boiling point.There are four types of interaction between the molecules with different strength. More polarised bond comes with a greater charge on atoms, which causes the more intermolecular force between them.On increasing, the strength of bond, boiling point will also increase.

The different intermolecular force between the molecule in decreasing order as follow:-

ionic bond > H- bond > dipole-dipole interactions > london "dispersion" force

According to me,

butyric acid = Dipole-dipole bonding

4-butyro-lactone = H-bonding

1,4 dioxane= london dispersion force

1) 4-butyro-lactone has strongest intermolecular forces because intermolecular bond in 4-butyro-lactone is H- bonding which is stronger than London and dipole-dipole force.This leads to increase in its boiling point. H-bonding in the molecule is not as much polarised as ionic bond and posses covalent character too but greater than dipole-dipole interaction.This leads to increase in boiling point as compared to dipole-dipole interaction.

2) 1,4-dioxane has weakest intermolecular force i.e. london "dispersion" force which is formed by instant polarisation which is less than H- bond and dipole-dipole interaction.

Hope, you got it what you want.

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