Which of the following compounds belongs to the same homologous series?

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$C H_{2} COOH$

$C H_{3} COOH$

$HCOOH$

$C H_{3} C H_{2} COOH$

answer is A, C, D.

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Detailed Solution

$HCOOH, C H_{3} COOH, C H_{3} C H_{2} COOH$ compounds belong to the same homologous series.
A homologous series is a group of substances that have the same chemical characteristics as they have the same functional groups, which differ by $C H_{2}$ unit.

Inorganic compounds with the same general formula have been found to include carbon chains of various lengths. Formic acid $(HCOOH)$ , acetic acid $(C H_{3} COOH)$ and propanoic acid $(C H_{3} C H_{2} COOH)$ are homologous series which differ in $C H_{2}$ unit.