Question

List the substances Ar, Cl2, CH4, and CH3COOH, in order of increasing strength of intermolecular attractions. List the substances , , , and , in order of increasing strength of intermolecular attractions. CH4 < Ar< CH3COOH < Cl2 CH3COOH < Cl2 < Ar < CH4 Ar < Cl2 < CH4 < CH3COOH Cl2 < CH3COOH < Ar < CH4 CH4 < Ar < Cl2 < CH3COOH

Answer 1

The substances Ar, Cl2, CH4, and CH3COOH can be ranked in increasing order of strength of intermolecular attractions as CH4 < Ar < Cl2 < CH3COOH.

Step-by-step explanation:

The intermolecular forces in the given substances can be ranked from weakest to strongest as follows:

1. Ar - Argon: The intermolecular force in Argon is London dispersion force, which is the weakest type of intermolecular force.
2. Cl2 - Chlorine: Chlorine is a diatomic molecule and the intermolecular force here is also London dispersion force.
3. CH4 - Methane: Methane has a tetrahedral molecular shape and the only intermolecular force present is London dispersion force.
4. CH3COOH - Acetic Acid: Acetic acid contains a polar functional group -COOH which allows it to form dipole-dipole interactions, making it the substance with the strongest intermolecular attractions.

Answer 2

Order of increasing strength of intermolecular attraction:

`CH_3COOH` >
`Cl_2` >
`CH_4` > Ar

Step-by-step explanation:

`CH_3COOH` can form hydrogen bond as H atom is attached with electronegative atom O.

Rest three,
`Cl_2`,
`CH_4`, Ar are non-polar molecules.

In non-polar molecules, van der Waal's intermolecular forces of attractions exist. Hydrogen bonding is stronger intermolecular attraction then van der Waal's intermolecular forces of attraction, hence,
`CH_3COOH` has strongest intermolecular attractions.

Ar will have least intermolecular attraction, as it behaves almost as ideal gas and there is no intermolecular attraction exist between molecules of ideal gases.

Molecular size and mass of
`Cl_2` is high as compared to
`CH_4`.

van der Waals intermolecular forces of attraction increases with increase in size.

Therefore,

Order of increasing strength of intermolecular attraction will be:

`CH_3COOH` >
`Cl_2` >
`CH_4` > Ar