Question:
Identify the name of second higher homologue of formic acid?
Identify the name of second higher homologue of formic acid?
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Homologues differ by one CH2 unit, so count up from HCOOH twice.
Updated On: Oct 1, 2026
- Methanoic acid
- Ethanoic acid
- Propanoic acid
- Butanoic acidaa
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
A homologous series is a family of compounds that differ from the next member by a \(-\text{CH}_2-\) unit. Formic acid, \(\text{HCOOH}\), is the first member of the carboxylic acid series.
Step 2: Key Formula or Approach:
First higher homologue \(=\) formic acid \(+ \text{CH}_2\). Second higher homologue \(=\) formic acid \(+ 2\text{CH}_2\).
Step 3: Detailed Explanation:
\(\text{HCOOH}\) (methanoic acid) \(+ \text{CH}_2 = \text{CH}_3\text{COOH}\) (ethanoic acid), the first higher homologue.
\(\text{CH}_3\text{COOH} + \text{CH}_2 = \text{CH}_3\text{CH}_2\text{COOH}\) (propanoic acid), the second higher homologue.
Methanoic acid is formic acid itself, ethanoic acid is the first higher homologue, and butanoic acid is the third higher homologue.
Final Answer:
The second higher homologue is propanoic acid, option (C). \[ \boxed{\text{Propanoic acid}} \]
A homologous series is a family of compounds that differ from the next member by a \(-\text{CH}_2-\) unit. Formic acid, \(\text{HCOOH}\), is the first member of the carboxylic acid series.
Step 2: Key Formula or Approach:
First higher homologue \(=\) formic acid \(+ \text{CH}_2\). Second higher homologue \(=\) formic acid \(+ 2\text{CH}_2\).
Step 3: Detailed Explanation:
\(\text{HCOOH}\) (methanoic acid) \(+ \text{CH}_2 = \text{CH}_3\text{COOH}\) (ethanoic acid), the first higher homologue.
\(\text{CH}_3\text{COOH} + \text{CH}_2 = \text{CH}_3\text{CH}_2\text{COOH}\) (propanoic acid), the second higher homologue.
Methanoic acid is formic acid itself, ethanoic acid is the first higher homologue, and butanoic acid is the third higher homologue.
Final Answer:
The second higher homologue is propanoic acid, option (C). \[ \boxed{\text{Propanoic acid}} \]
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