Question

In which molecule the van der Waal’s force is likely to be the
most important in determining the m.pt. and b.pt.?
(a) H₂S (b) Br₂
(c) HCl (d) CO

Answer 1

Answer:

In which molecule the van der Waal’s force is likely to be the

most important in determining the m.pt. and b.pt.?

(a) H₂S

(b) Br₂

(c) HCl

(d) CO

Answer 2

Br₂ is the molecule with van der Waals force as the most important factor.

Explanation:

• van der Waals force is defined as the smallest force of attraction between the molecules.

• Its mainly the gravitational force between the molecules.

• When other forces like hydrogen bonds, dipole dipole interactions are present, the van der Waal’s force cannot effect the system.

• van der Waals force is present in each and every molecule.

• In the given molecules, H2S, HCl and CO, there's an electronegativity difference between the participating atoms.

• So there will be a dipole dipole interaction.

• But in bromine, both atoms are bromine with same electronegativity.

• So no dipole is found here.

• So van der Waal’s force is the only force of attraction here which can effect the melting point and boiling points of bromine.

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