Question

Carbon diselenide (CSe2) is a liquid at room temperature. The normal boiling point is 125°C, and the melting point is –45.5°C. Carbon disulfide (CS2) is also a liquid at room temperature with normal boiling and melting points of 46.5°C and –111.6°C, respectively. How do the strengths of the intermolecular forces may vary from CO2 to CS2 to CSe2?

Answer 1

Answer:

Explanation:  The strengths of the inter molecular forces varies as follows -

        $CO_{2}< CS_{2} < CSe_{2}$

The normal boiling point of CSe2 is 125°C and that of CS2 is 116°C, which explains the trend that as we move down the group, the boiling point of e compound increases as the size increases.

This usually happens because larger and heavier atoms have a tendency to exhibit greater inter molecular strengths due to the increase in size . As the size increases, the valence shell electrons move far away from the nucleus, thus has a greater tendency to attract the temporary dipoles.

And larger the inter molecular forces, more tightly the electrons will be held to each other and thus more thermal energy would be required to break the bonds between them.