Carbon diselenide (CSe2) is a liquid at room temperature. The normal boiling point is 1258C, and the melting point is 245.58C. Carbon disulfide (CS2) is also a liquid at room temperature, with normal boiling and melting points of 46.58C and 2111.68C, respectively. How do the strengths of the intermolecular forces vary from CO2 to CS2 to CSe2? Explain your answer.

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