Which one is not a nucleophile ?
Correct answer: D. H3C+
- A. C2H5O-
- B. SCN-
- C. NH3
- D. H3C+
Explanation
A nucleophile donates an electron pair, so C2H5O-, SCN- and NH3 can attack an electron-deficient centre. H3C+ is electron-deficient and accepts an electron pair, making it an electrophile rather than a nucleophile. Students may choose NH3 because it is neutral, but neutral species can still act as nucleophiles through a lone pair.
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About Nucleophilic Substitution
Nucleophilic substitution replaces a leaving group in an alkyl halide when an electron-rich nucleophile attacks the carbon atom. The topic compares SN1 and SN2 mechanisms, including reaction conditions, substrate structure, solvent effects, nucleophile strength, carbocation formation and stereochemical changes, and distinguishes substitution from elimination.
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