Which one of the following is notan isomer of 3-methylbut-1-yne ?

1.	Which one of the following is notan isomer of 3-methylbut-1-yne ?
Answer» Pent-1-yne Buta-1, 3-diene Pent-2-yne Penta-1, 3-diene Solution :Isomers have same molecular formula but different STRUCTURES. Buta-1, 3-diene, i.e., option (b) has only four CARBON atoms but all others have FIVE carbon atoms. Therefore, (b) is not the isomer of the rest of the COMPOUNDS.

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