The correct answer is option D.
The pair of molecules which is expected to have the most different properties is SO2 and CH4.
Both sulfur dioxide (S[tex]O_{2}[/tex]) and methane i.e. C[tex]H_{4}[/tex] molecules are gases in nature.
The properties of gaseous sulfur dioxide are that it is colorless and has a choking strong smell and is obtained by the combustion of fossil fuels.
Smelting of the metal ores also produces sulfur.
When sulfur dioxide molecule combines with water it forms sulfuric acid i.e. [tex]H_{2}[/tex] [tex]SO_{4}[/tex]
While methane is a flammable colorless gas. Moreover, it is non toxic gas but it is one of the chief components of the fuels.
It is also characterized as the green house gas.
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