Which of the following belong to a homologous series?
1. $H C O O H$
2. $C H_{3} C O O H$
3. $C_{2} H_{6}$
4. $C_{2} H_{5} C O O H$
5. $C_{3} H_{6}$

1, 2 and 5

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1, 3 and 4

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1, 2 and 4

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1, 2 and 3

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Solution

The correct option is C 1, 2 and 4
A homologous series is a series of compounds in which each member differ from the previous/next member by $C H_{2}$ or 14 mass units and have the same functional group.
1, 2 and 4 have same functional group (-COOH), so they are homologous in nature. $C_{2} H_{6}$ and $C_{3} H_{6}$ are neither homologous with 1, 2 and 4 nor with each other.

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Which of the following belong to a homologous series? 1. HCOOH 2. CH3COOH 3. C2H6 4. C2H5COOH 5. C3H6

Which of the following belong to a homologous series?
1. $H C O O H$
2. $C H_{3} C O O H$
3. $C_{2} H_{6}$
4. $C_{2} H_{5} C O O H$
5. $C_{3} H_{6}$