Which of the following is not a nucleophile?

Name: Which of the following is not a nucleophile?
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Question

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Nucleophiles are species that donate a pair of electrons to form a chemical bond. Options A, B, and C are all capable of donating electrons due to the presence of lone pairs or negative charges. Option D represents a positively charged species, which makes it an electrophile rather than a nucleophile, as it is more likely to accept electrons.

Which of the Following Is Not a Nucleophile? A) HC≡C:−\mathrm { HC } \equiv \mathrm { C } : ^-HC≡C:−

Which of the Following Is Not a Nucleophile?
A) $\mathrm { HC } \equiv \mathrm { C } : ^-$