Question

Which of the following does not belong to the same homologous series? Write reason for your choice. (1m)
(a) C2H4
(b) C3H6
(c) C4H8
(d) C5 H12

Answer 1

Answer:

Alkanes−CnH2n+2

Alkenes−CnH2n

Alkynes−CnH2n−2

n=no of carbon atoms.

Ethane and propane belong to the same series while C4H8 belong to alkene series.

Answer 2

Answer:-

• (d) C5 H12✔

• Reason:- In organic chemistry, a homologous series is a sequence of compounds with the same functional group and similar chemical properties in which the members of the series can be branched or unbranched, or differ by -CH2.

• Here all except C512 are following the general formula -CH2.

• Thus, C5H12 is not belonging to the same homologous series.

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