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How to determine order of nucleophilicity among commonly used nucleophiles? For eg.example, in Finklestein reaction, $\ce{NaI}$ (reagent) - taken in acetone  (solvent) - displaces $\ce{SH-}$ ion from alkyl group via SN2SN2 mechanism to form an alkyl iodide. But in a separate question we may be asked to write the product formed when $\ce{NaSH}$ reacts with an alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace $\ce{I-}$ and form $\ce{alkyl-SH}$. But definitely only one of the reactions shall occur. 

So, my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 and(college entrance exam in India), so I am expecting answers which within thisits scope of knowledge.

For eg. in Finklestein reaction, $\ce{NaI}$ (reagent) taken in acetone(solvent) displaces $\ce{SH-}$ ion from alkyl group via SN2 mechanism to form alkyl iodide. But in a separate question we may be asked to write the product formed when $\ce{NaSH}$ reacts with alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace $\ce{I-}$ and form $\ce{alkyl-SH}$. But definitely only one of the reactions shall occur. So my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 and am expecting answers which within this scope of knowledge.

How to determine order of nucleophilicity among commonly used nucleophiles? For example, in Finklestein reaction, $\ce{NaI}$ (reagent) - taken in acetone  (solvent) - displaces $\ce{SH-}$ ion from alkyl group via SN2 mechanism to form an alkyl iodide. But in a separate question we may be asked to write the product formed when $\ce{NaSH}$ reacts with an alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace $\ce{I-}$ and form $\ce{alkyl-SH}$. But definitely only one of the reactions shall occur. 

So, my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 (college entrance exam in India), so I am expecting answers within its scope.

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For eg. Inin Finklestein reaction, NaI$\ce{NaI}$ (reagent) taken in acetone(solvent) displaces SH(-)$\ce{SH-}$ ion from alkyl group via SN2 mechanism to form alkyl iodide. But in a separate question we may be asked to write the product formed when NaSH$\ce{NaSH}$ reacts with alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace I(-)$\ce{I-}$ and form alkyl-SH$\ce{alkyl-SH}$. But definitely only one of the reactions shall occur. So my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 and am expecting answers which within this scope of knowledge.

For eg. In Finklestein reaction, NaI(reagent) taken in acetone(solvent) displaces SH(-) ion from alkyl group via SN2 mechanism to form alkyl iodide. But in a separate question we may be asked to write the product formed when NaSH reacts with alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace I(-) and form alkyl-SH. But definitely only one of the reactions shall occur. So my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 and am expecting answers which within this scope of knowledge.

For eg. in Finklestein reaction, $\ce{NaI}$ (reagent) taken in acetone(solvent) displaces $\ce{SH-}$ ion from alkyl group via SN2 mechanism to form alkyl iodide. But in a separate question we may be asked to write the product formed when $\ce{NaSH}$ reacts with alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace $\ce{I-}$ and form $\ce{alkyl-SH}$. But definitely only one of the reactions shall occur. So my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 and am expecting answers which within this scope of knowledge.

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How to determine order of nucleophilicity among commonly used nucleophiles?

For eg. In Finklestein reaction, NaI(reagent) taken in acetone(solvent) displaces SH(-) ion from alkyl group via SN2 mechanism to form alkyl iodide. But in a separate question we may be asked to write the product formed when NaSH reacts with alkyl iodide in the presence of acetone. Since I do not know which of the two is a stronger nucleophile, I will displace I(-) and form alkyl-SH. But definitely only one of the reactions shall occur. So my question is that is there an order of strength of nucleophilicity (like a metal reactivity series)? I am preparing for JEE Advanced 2015 and am expecting answers which within this scope of knowledge.