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(D) homologous series is a group of organic compounds having the same functional group and similar chemical properties,where each successive member di

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$2-Butyne$

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(D) homologous series is a group of organic compounds having the same functional group and similar chemical properties,where each successive member differs by a $-CH_2-$ group. $Ethene$ $(C_2H_4)$,$1-Butene$ $(C_4H_8)$,and $2-Butene$ $(C_4H_8)$ are all alkenes with the general formula $C_nH_{2n}$. $2-Butyne$ $(C_4H_6)$ is an alkyne with the general formula $C_nH_{2n-2}$. Therefore,$2-Butyne$ does not belong to the same homologous series as the others.

Which of the following does not belong to the same homologous series?

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