The decreasing order of nucleophilicity of the following is
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a
IV>III>I>II
b
III>I>II>IV
c
IV > III > II > I
d
I>II>III>IV
answer is C.
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Detailed Solution
In the present case, basicity parallels nucleophilicity. R3C-is the strongest base hence, strongest nucleophile. F- is weakest base therefore weakest nucleophile. R2N- is stronger base and stronger nucleophile than RO-.