Nucleophile: If something tends to provide electron pairs to electrophiles in order to establish chemical bonds with them, it is termed to be a nucleophile.
are some examples of the nucleophile.
Sulfuric Acid: The formula of sulfuric acid is .
In sulfuric acid, oxygen has loan pair of the electron to donate so it acts as a nucleophile.
Sulfuric acid a has conjugate base which is a good nucleophile as it is electron-rich species.
We can say that a conjugate base is always a better nucleophile as compared to a molecule.