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Q.

In the following set of nucleophiles, the strongest and the weakest nucleophile respectively are 
I. CH3S-         II. CH3COO-    III. HO-       IV. C6H5O-
 

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a

Both III and II 

b

Both IV and II

c

Both I and IV

d

Both I and II

answer is B.

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Detailed Solution

CH3S-(I)  is strongest nucleophile due to ease of donation of electron and C6H5O-(IV) is weakest due to resonance stabilization in it.

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