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Question

Identify the homologous series among the following:
1. HCOOH
2. CH3COOH
3. C2H6
4. C2H5COOH
5. Propanone

A
1, 2 and 5 are homologous series
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B
1, 3 and 4 belong to the same homologous series
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C
1, 2 and 4 belong to the same homologous series
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D
1, 2 and 5 belong to the same homologous series
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Solution

The correct option is C 1, 2 and 4 belong to the same homologous series
A series of compounds in which the same functional group substitutes for hydrogen in a carbon chain is called a homologous series. 1, 2 and 4 have same functional group (-COOH), so they are homologous in nature. The functional group of propanone is ketone, so it is not homologous with 1, 2 and 4. Again C2H6 does not have any functional group, so it is not homologous with 1, 2 and 4.

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