Question : Identify a hydrocarbon pair that is not part of the homologous series.
Option 1: CH4 and C2H6
Option 2: C2H6 and C3H9
Option 3: C2H6 and C3H8
Option 4: C4H8 and C5H10
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Correct Answer: C 2 H 6 and C 3 H 9
Solution : The correct answer is C 2 H 6 and C 3 H 9 .
A homologous series is a collection of compounds that share some functional groups but differ from one member to the next by CH 2 . Organic molecules with the same general formula have been found to contain carbon chains of different lengths. C 3 H 9 is not a valid hydrocarbon since it implies an unsaturation or extra hydrogen atoms.
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