Nucleophilicity in substitution reactions

[swap1996]

Is there any absolute order of the nucleophilicity of nucleophiles participating in organic substitution reactions or is it dependent on solvent,substrate or any other factors ? If so,how?

 

[projjal]

I think the nucleophilicity of the nucleophiles should depend upon the solvent(like its polarity) and other factors, but for a particular solvent keeping other factors same there would be a definite order.

 

[swap1996]

I think the nucleophilicity of the nucleophiles should depend upon the solvent(like its polarity) and other factors, but for a particular solvent keeping other factors same there would be a definite order.

so what's that?