The melting and boiling points of the members of homologous series increase gradually because of:

increase in molecular size

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decrease in atomic number

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increase in number of

C

atoms

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None of these

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Solution

The correct options are
A increase in molecular size
D increase in number of $C$ atoms
The number of $C$ atoms in homologous series increases gradually. Van der Waal's force increases as the molecules get bigger. Hence, the melting and boiling points of the members of homologous series increase gradually because their molecular masses increase.

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