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

(a) CH_4

(b) C_2 H_6

(c) C_3 H_8

(d) C_4 H_{8} 

Answers (1)

Answer:(d)

Solution:

A homologous series is a group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by  CH_2 group.

So, homologous series of alkanes is

Methane       CH_4

Ethane           C_2 H_6

Propane        C_3 H_8

Butane           C_4 H_{8}

So, C_4H_8 does not belong to the homologous series

Therefore, option (d) is correct.

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