Question

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

• A. $N{a}^{+}$remains unsolvated.
• B. $C{l}^{-}$remains unsolvated.
• C. $C{l}^{-}$ is solvated by the solvent.
• D. Both (a) and (b)

Answer 1

The correct option is B $C{l}^{-}$remains unsolvated.

Nucleophilicity in polar aprotic solvents like DMSO, acetone etc:
$N{a}^{+}$ is solvated as shown, but halide i.e. $C{l}^{-}$ ion cannot be solvated because the partial positive charge of sulphur is hindered by the methyl groups. So, it remains unsolvated.