The correct order of nucleophilicity is

We need to identify the correct order of nucleophilicity from the given options.

Key Principle: A stronger base (more electron-rich species) is generally a better nucleophile when comparing species with the same attacking atom or in the same solvent conditions. Negatively charged species are stronger nucleophiles than their neutral counterparts.

$$F^-$$ is a weaker nucleophile than $$OH^-$$ because fluorine is more electronegative and holds its electron density more tightly. Also, $$F^-$$ is heavily solvated in protic solvents. This order is incorrect.

$$OH^-$$ has a negative charge and is a much stronger nucleophile than neutral $$H_2O$$. This order is incorrect.

$$RO^-$$ (alkoxide ion) is negatively charged and is a much stronger nucleophile than the neutral alcohol $$ROH$$. This order is incorrect.

$$NH_2^-$$ (amide ion) carries a negative charge and has a lone pair readily available for donation. It is a much stronger nucleophile than neutral $$NH_3$$. This order is correct.

The correct answer is Option D: $$NH_2^- > NH_3$$.