which of the following is nat a nucleophilic. A =ammonia. B=primary amine C=secondary amine D=ammonium ion
Answers
Answer: The Correct answer is option B: Primary Amine
Explanation:
Proper Question: Which of the following is not a nucleophile:
(A.) Ammonia
(B.) Primary amine
(C.) Secondary amine
(D.) Ammonium ion
Answer: Ammonium ion is not a nucleophile. Therefore the correct option is (D.) Ammonium ion.
Step-by-step explanation:
→ Nucleophiles are those species which have an electron-donating tendency. These species attack at the e⁻ deficient centre.
→ Nucleophiles are e⁻ rich specie and they have an attraction towards the nucleus or positive charge.
→ All species which are negatively charged can act as a nucleophile. For example: Cl⁻, Br⁻, C₂H₅O⁻, etc.
→ Species which have a lone pair of electrons can also be categorized as a nucleophile. For example:- :NH₃, H₂Ö, :PCl₃, R-ÖH, etc.
→ In the given question:
(A.) Ammonia: It has a lone pair of electrons on the nitrogen atom, therefore it is a nucleophile.
(B.) Primary amine: It has a lone pair of electrons on the nitrogen atom, therefore it is a nucleophile.
(C.) Secondary amine: It has a lone pair of electrons on the nitrogen atom, therefore it is a nucleophile.
(D.) Ammonium ion: It is a positively charged specie. Neither it has a negative charge nor it has a lone pair of electrons that can be donated. Therefore ammonium ion is not a nucleophile.
Hence Ammonium ion is not a nucleophile out of the given species. Therefore the correct option is (D.) Ammonium ion.
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