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The successive members of a homologous series differ by an unit of which of the following?

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in Chemistry – Class 11 by (148k points)
The successive members of a homologous series differ by an unit of which of the following?

(a) –CH3

(b) CH3CH3

(c) –CH2

(d) –CH2CH3

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The query is from Classification of Organic Compounds in chapter Organic Chemistry – Basic Principles and Technique of Chemistry – Class 11

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The correct choice is (c) –CH2

To explain I would say: The successive members of a homologous series differ by a CH2 unit. Taking, methanol (CH3OH), ethanol (CH3CH2OH), and propanol (CH3CH2CH2OH) as examples. From this, we clearly understand that as the series progresses, the difference between each successive member is a CH2 unit.

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