Which of the following forms a set of homologous series?

Correct option is B

The correct answer is (b) Ethyne, propyne, and butyne.
· A homologous series is a group of organic compounds that have the same functional group and differ by a CH₂ group. Each successive member of the series increases by a -CH₂ unit.
· Ethyne (C₂H₂), Propyne (C₃H₄), and Butyne (C₄H₆) are all alkynes, characterized by having a triple bond between two carbon atoms, and they differ by a CH₂ unit.
Information Booster:
· Ethane, methane, and ethyne: These belong to different functional groups (alkane and alkyne) and do not form a homologous series.
· Ethyne, propyne, and butene: While ethyne and propyne are alkynes, butene is an alkene, so they do not form a homologous series.
· Ethane, methane, and propene: These belong to different functional groups (alkane and alkene) and do not form a homologous series.