Which pair of compounds will show different chemical properties despite having the same molecular formula?
Butane and isobutane
The pair asked for must share one molecular formula. Butane and isobutane are both C4H10: butane is the straight chain CH3-CH2-CH2-CH3, while isobutane (2-methylpropane) is branched, so they are structural isomers and differ in properties such as boiling point and reactivity pattern.
The other pairs do not even share a formula: propanol is C3H8O against methanol CH4O, ethanol is C2H6O against ethanoic acid C2H4O2, and ethane C2H6 against ethene C2H4.
Hence, the answer is Butane and isobutane.
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