$C H_{4}$ and $C_{2} H_{6}$ belong to the same homologous series and they differ by a unit.

C H_{2}

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C H_{3}

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C H

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Solution

The correct option is A $C H_{2}$
Homologous series refer to a series of compounds that can be represented by a general formula. For example, alkanes $(C_{n} H_{2 n + 2})$ , alkenes $(C_{n} H_{2 n})$ , etc.

Methane $(C H_{4})$ and ethane $(C_{2} H_{6})$ belong to the same homologous series. Each successive member in a homologous series differ by a $C H_{2}$ group.

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Similar questions

(a) What is a homologous series? Explain with an example.
(b) State two characteristics of a homologous series.
(c) The molecular formula of an organic compound is C₁₈H₃₆. Name its homologous series.
(d) Select the hydrocarbons which belong to the same homologous series. Give the name of each series.
CH₄, C₂H₂, C₂H₄, C₂H₆, C₄H₁₀, C₃H₄, C₃H₆
(e) What is meant by 'heteroatom'? Give examples. Write the names and formulae of two organic compounds containing different heteroatoms.