Question:
Which from following statements is NOT true about homologous series?
Which from following statements is NOT true about homologous series?
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Successive members of a homologous series differ by a methylene (\(\text{CH}_2\)) group.
Updated On: Oct 1, 2026
- Each member of a series has same functional group.
- Each member has same type of carbon skeleton.
- Each member differs by ethylene group from next member.
- All members of series possess similar chemical properties.
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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 with the same functional group and similar chemical properties, whose neighbouring members differ by a fixed unit.
Step 2: Detailed Explanation
(A) Same functional group: true.
(B) Same type of carbon skeleton: true.
(D) Similar chemical properties: true.
(C) Neighbouring members differ by a methylene group, \(-\text{CH}_2-\) (14 mass units), not an ethylene group, which is \(\text{C}_2\text{H}_4\). So (C) is not true.
Final Answer:
The difference is a \(\text{CH}_2\) group, so statement (C) is the false one. \[ \boxed{\text{(C)}} \]
A homologous series is a family of compounds with the same functional group and similar chemical properties, whose neighbouring members differ by a fixed unit.
Step 2: Detailed Explanation
(A) Same functional group: true.
(B) Same type of carbon skeleton: true.
(D) Similar chemical properties: true.
(C) Neighbouring members differ by a methylene group, \(-\text{CH}_2-\) (14 mass units), not an ethylene group, which is \(\text{C}_2\text{H}_4\). So (C) is not true.
Final Answer:
The difference is a \(\text{CH}_2\) group, so statement (C) is the false one. \[ \boxed{\text{(C)}} \]
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