Question

The nucleophilicity order of halogens in polar protic solvent is :

• A. $F^{-}>C{l}^{-}>B{r}^{-}>I^{-}$
• B. $F^{-}>I^{-}>B{r}^{-}>F^{-}$
• C. $F^{-}<C{l}^{-}<B{r}^{-}<I^{-}$
• D. $C{l}^{-}>F^{-}>B{r}^{-}>I^{-}$

Answer 1

The correct option is C $F^{-}<C{l}^{-}<B{r}^{-}<I^{-}$

The degree of hydration of anions increases with the decrease in the size of the anions and hence nuclephilicity decreases in polar protic solvent.
Correct order of anionic size is $F^{-}<C{l}^{-}<B{r}^{-}<I^{-}$.
Correct order of degree of hydration is $F^{-}>C{l}^{-}>B{r}^{-}>I^{-}$
Correct order of nucleophilicity in polar protic solvent is $F^{-}<C{l}^{-}<B{r}^{-}<I^{-}$.