Question

The rate of $SN ^2$ 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., $CCl _4, CS _2$ ) of the following is: $I ^{\ominus}> Br ^{\ominus}> Cl ^{\ominus}> F ^{\ominus}$
• 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: $F ^{\ominus}> Cl ^{\ominus}> Br ^{\ominus}> I ^{\ominus}$
• D. The nucleophilicity order in polar aprotic solvents (e.g., DMSO, DMF) of the following is: $F ^{\ominus}> Cl ^{\ominus}> Br \ominus> I ^{\ominus}$

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: $F ^{\ominus}> Cl ^{\ominus}> Br ^{\ominus}> I ^{\ominus}$