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Two compounds are considered isomers if they have the same molecular formula (i.e. the same numbers and types of atoms) but different structures.
Examples:
1-butyne and 2-butyne (they both have the formula C4H6)
1-butyne
2-butyne
HCCCH2CH3
CH3CCCH3
2-heptyne and 2-methyl-3-hexyne (formula C7H12)
2-heptyne
2-methyl-3-hexyne
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