Question

The rate of $S{N}^2$ reaction depends on the effectiveness of the nucleophile in ejecting the leaving group. Nucleophilicity is the affinity for C atom, while basicity is the affinity for proton

In both cases, a new bond is formed. If a new bond is formed between the anion and proton, the species acts as a base. If a new bond is formed between the anion and $C$ atom, the species acts as nucleophile
Which of the following statements is wrong?

• A. The nucleophilicity order in non-polar solvents (e.g., $CC{l}_4,C{S}_2$ ) of the following is: $I^{\ominus }>B{r}^{\ominus }>C{l}^{\ominus }>F^{\ominus }$
• B. The nucleophilicity order in polar protic solvents (e.g., $H_{2}O$ ) of the following is: $I^{\ominus }>Br\ominus >Cl\ominus >F\ominus$
• C. The nucleophilicity order in weakly polar protic solvents (e.g., nitro benzene, acetone) of the following is: $F^{\ominus }>C{l}^{\ominus }>B{r}^{\ominus }>I^{\ominus }$
• D. The nucleophilicity order in polar aprotic solvents (e.g., DMSO, DMF) of the following is: $F^{\ominus }>C{l}^{\ominus }>Br\ominus >I^{\ominus }$

Answer 1

Answer: (C)

Correct answer is (c) The nucleophilicity order in weakly polar protic solvents (e.g., nitro benzene, acetone) of the following is: $F^{\ominus }>C{l}^{\ominus }>B{r}^{\ominus }>I^{\ominus }$