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Question

Write the molecular formula of the 2nd and 3rd member of the homologous series whose first member is methane.


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Solution

The organic compounds constituting only Carbon (C) and Hydrogen (H) atoms are called hydrocarbons.

The organic compounds containing carbon atoms have a single bond between two carbon atoms are called saturated hydrocarbons.

Example: Methane (CH4)

A homologous series is a collection of molecules with the same chemical characteristics and similar functional groups that differ by -CH2 group from one another

The difference between CH4 and C2H6 is -CH2 unit, whereas Ethane (C2H6) and propane (C3H8) is also differed by -CH2 unit. As a result, both are homologous.

Therefore, the molecular formula of the 2nd and 3rd members of the homologous series is Ethane C2H6 and Propane C3H8.


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