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Which of the following pairs of compounds are constitutional isomers?
A
Cyclohexane and benzene
B
Methanol and ethanol
C
and
D
and
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Understand the definition of constitutional isomers: Constitutional isomers are compounds that have the same molecular formula but different connectivity of atoms within the molecules.
Analyze the molecular formula of cyclohexane (C6H12) and benzene (C6H6). Notice that they have different molecular formulas, so they cannot be constitutional isomers.
Examine the molecular formula of methanol (CH3OH) and ethanol (C2H5OH). They have different molecular formulas, so they are not constitutional isomers.
Look at the molecular formula of ethene (C2H4) and ethyne (C2H2). They have different molecular formulas, so they are not constitutional isomers.
Consider butane (C4H10) and 2-methylpropane (C4H10). They have the same molecular formula but different connectivity of atoms, making them constitutional isomers.