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Which of these, unlike physical properties such as melting/boiling point, does NOT show a gradation with increasing molecular mass within a homologous series

Question
Which of these, unlike physical properties such as melting/boiling point, does NOT show a gradation with increasing molecular mass within a homologous series
Melting point
Chemical properties, which are determined by the functional group
Boiling point
Solubility
Answer
Chemical properties, which are determined by the functional group
Detailed Explanation
Chemical properties, determined solely by the functional group, stay similar throughout a homologous series, unlike physical properties.
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