Which of the following reactive intermediates can best be described as both nucleophilic and strongly basic?

Question

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Carbanions are negatively charged species that have a lone pair of electrons and a negative charge. This lone pair of electrons makes them nucleophilic, and the negative charge makes them strongly basic. Carbocations, on the other hand, are positively charged species and are therefore not basic. Carbenes are neutral and can be either electrophilic or nucleophilic, but they are not strongly basic. Free radicals are neutral and do not have a lone pair of electrons, so they are not nucleophilic or basic. Alkanes are neutral molecules and are not reactive intermediates.

Which of the Following Reactive Intermediates Can Best Be Described