What is the difference in molecular mass between two successive members of a homologous series?
Answer and explanation
Correct answer: Fourteen units
Successive members of a homologous series differ by one –CH₂– unit in their molecular formula. The relative molecular mass of carbon is 12 and that of two hydrogen atoms is 2, so the increase is 12 + 2 = 14 units. This constant difference is a defining pattern of homologous series. Ten, two, and eighteen do not represent the mass of the added CH₂ group. Therefore, option A is correct.
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What is the correct answer to this question?
Fourteen units
Why is this the correct answer?
Successive members of a homologous series differ by one –CH₂– unit in their molecular formula. The relative molecular mass of carbon is 12 and that of two hydrogen atoms is 2, so the increase is 12 + 2 = 14 units. This constant difference is a defining pattern of homologous series. Ten, two, and eighteen do not represent the mass of the added CH₂ group. Therefore, option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Carbon and its Compounds.
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