Which of the following halide ion (X-) is good nucleophile and good leaving group?
Correct answer: A. I-
- A. I-
- B. Cl-
- C. F-
- D. Br-
Explanation
Iodide ion (I⁻) is a good nucleophile and a good leaving group. This is because it is the largest of the halide ions, which means that it has the weakest electronegativity and the most polarizability. The weak electronegativity makes iodide ion a good nucleophile, because it is less likely to be repelled by the electron-rich carbon atom that it is attacking. The polarizability makes iodide ion a good leaving group, because it can easily distort its electron cloud to accommodate the negative charge. Therefore, option a is correct.
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About Alkyl Halides
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
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