Question

In slovents like DMSO and acetonitrile the $F^{-}$ ion of dissolved $NaF$ is more reactive then in methylalcohol because

• A. $C{H}_{3}OH$ is more polar than DMSO and $C{H}_{3}CN$
• B. $C{H}_{3}OH$ is less polar than DMSO and $C{H}_{3}CN$
• C. Unslovated $F^{-}$ ion is DMSO or $C{H}_{3}CN$ acts more effectively as nucleophile
• D. $-OH$ group is better leaving group than $F^{-}$ ion

Answer 1

The correct option is C Unslovated $F^{-}$ ion is DMSO or $C{H}_{3}CN$ acts more effectively as nucleophile

In methyl alcohol, $F^{-}$ is solved but in DMSO or $C{H}_{3}CN$ (polar aprotic solvent) $F^{-}$ ion is not solvated. Hence, unsolveted $F^{-}$ ion acts more effectively as a nucleophile. Thus, it is more reactive in polar aprotic solvents.