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How many valid pairs (P1, P2) are possible such that 'P1-methylpent-P2-yne' is a correct IUPAC name, where P1 denotes the position of the methyl substituent and P2 denotes the position of the triple bond?
- 1
- 2
- 3
- 4
Correct answer: 3
Solution
The parent chain pentyne can have the triple bond at position 1, 2, or 3. For each, we check which methyl positions give valid unique IUPAC names without redundancy or lower-locant violations. Three valid (P1, P2) pairs emerge: (4,2), (2,3), and (4,3).
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