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Question

Rank the following solvents in decreasing order of ability to dissolve given compound.
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A
Et2O>H2O>EtOH
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B
H2O>EtOH>Et2O
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C
H2O>Et2O>EtOH
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D
Et2O>EtOH>H2O
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Solution

The correct option is D Et2O>EtOH>H2O
The extent of intermolecular hydrogen bonding will be maximum in water followed by EtOH and then by Et2O. This is because there are 2 hydrogen atoms directly attached to oxygen, whereas EtOH has 1 and Et2O has zero such hydrogens. The number of such hydrogen results in more hydrogen bonding. As the intermolecular hydrogen bonding increases, the ability to dissolve in the non-polar solvent decreases, due to the more association between solute molecules than solute and solvent molecules.
Hence, the order of ability to dissolve in a given non-polar solvent is- Et2O>EtOH>H2O

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