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Question

Which of the following is/are true when NaCl is dissolved in Dimethyl sulfoxide (DMSO)?

A
Na+remains unsolvated.
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B
Clremains unsolvated.
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C
Cl is solvated by the solvent.
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D
Both (a) and (b)
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Solution

The correct option is B Clremains unsolvated.
Nucleophilicity in polar aprotic solvents like DMSO, acetone etc:
Na+ is solvated as shown, but halide i.e. Cl ion cannot be solvated because the partial positive charge of sulphur is hindered by the methyl groups. So, it remains unsolvated.


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