Question:
What is the name of second lower homologue of \(\text{CH}_3(\text{CH}_2)_2\text{COOH}\) ?
What is the name of second lower homologue of \(\text{CH}_3(\text{CH}_2)_2\text{COOH}\) ?
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Each lower homologue has one CH2 group fewer.
Updated On: Oct 1, 2026
- Methanoic acid
- Ethanoic acid
- Propanoic acid
- Pentanoic acid
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Homologues in a series differ by a \(-\text{CH}_2-\) group. The given compound \(\text{CH}_3(\text{CH}_2)_2\text{COOH}\) has 4 carbons, so it is butanoic acid.
Step 2: Go down the series:
First lower homologue: remove one \(\text{CH}_2\), giving propanoic acid (3 carbons).
Second lower homologue: remove another \(\text{CH}_2\), giving ethanoic acid \(\text{CH}_3\text{COOH}\) (2 carbons).
Step 3: Check options:
Methanoic acid is the third lower homologue, propanoic acid is the first lower, and pentanoic acid is a higher homologue.
Final Answer:
The second lower homologue is ethanoic acid, option (B). \[ \boxed{\text{Ethanoic acid}} \]
Homologues in a series differ by a \(-\text{CH}_2-\) group. The given compound \(\text{CH}_3(\text{CH}_2)_2\text{COOH}\) has 4 carbons, so it is butanoic acid.
Step 2: Go down the series:
First lower homologue: remove one \(\text{CH}_2\), giving propanoic acid (3 carbons).
Second lower homologue: remove another \(\text{CH}_2\), giving ethanoic acid \(\text{CH}_3\text{COOH}\) (2 carbons).
Step 3: Check options:
Methanoic acid is the third lower homologue, propanoic acid is the first lower, and pentanoic acid is a higher homologue.
Final Answer:
The second lower homologue is ethanoic acid, option (B). \[ \boxed{\text{Ethanoic acid}} \]
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