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Q.

All the following are nucleophiles except

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a

NH3

b

SO3

c

CN-

d

H2O

answer is B.

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Detailed Solution

Sulphur trioxide does not contain a lone pair or negative charge on central atom….it is not a nucleophile ;Sulphur trioxide contains multiple bonds between dissimilar atoms, central atom is electron deficient……it is an electrophile.
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