Question:
Which one of the following is not an isomer of 3-methylbut-1-yne?
Which one of the following is not an isomer of 3-methylbut-1-yne?
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Always compare molecular formula first in isomerism questions.
Updated On: Apr 29, 2026
- 2,3-Dimethylbuta-1,3-diene
- Pent-1-yne
- Pent-2-yne
- Penta-1,3-diene
- 2-Methylbuta-1,3-diene
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The Correct Option is A
Solution and Explanation
Concept:
Isomers have the same molecular formula but different structures.
Step 1: Find formula of 3-methylbut-1-yne.
3-methylbut-1-yne has 5 carbon atoms and formula: \[ C_5H_8 \]
Step 2: Check option A.
2,3-Dimethylbuta-1,3-diene has 6 carbon atoms, so its formula is not \(C_5H_8\).
Step 3: Conclusion.
Therefore, it is not an isomer of 3-methylbut-1-yne.
Step 1: Find formula of 3-methylbut-1-yne.
3-methylbut-1-yne has 5 carbon atoms and formula: \[ C_5H_8 \]
Step 2: Check option A.
2,3-Dimethylbuta-1,3-diene has 6 carbon atoms, so its formula is not \(C_5H_8\).
Step 3: Conclusion.
Therefore, it is not an isomer of 3-methylbut-1-yne.
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