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The rate of SN^2 reaction depends on the...

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 specied 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., `C Cl_4, CS_2`) of the followind is :
`I^(Ө) gt Br^(Ө) gt Cl^(Ө) gt F^(Ө)`.

B

The nucleophilicity order in polar protic solvents (e.g., `H_2 O`) of the following is :
`I^(Ө) gt Br^(Ө) gt Cl^(Ө) gt F^(Ө)`.

C

The nucleophilicity order in weakly polar protic solvents (e.g., nitro benzene, acetone) of the following is :
`F^(Ө) gt Cl^(Ө) gt Br^(Ө) gt I^(Ө)`.

D

The nucleophilicity order in polar aprotic solvents (e.g., `DMSO, DMF`) of the following is :
`F^(Ө) gt Cl^(Ө) gt Br^(Ө) gt I^(Ө)`.

Text Solution

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The correct Answer is:
C
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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 specied 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 is wrong ?

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