Which alkyl halide has the highest reactivity for a particular alkyl group ?
Correct answer: D. R-I
- A. R-F
- B. R-C
- C. R-Br
- D. R-I
Explanation
For the same alkyl group, leaving-group ability increases from fluoride to iodide because the C-I bond is weaker and I- is more stable and polarizable. Hence R-I reacts most readily. Students may choose R-F because fluorine is the most electronegative halogen, but strong C-F bonding makes fluoride a poor leaving group.
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About Nucleophilic Substitution
Nucleophilic substitution replaces a leaving group in an alkyl halide when an electron-rich nucleophile attacks the carbon atom. The topic compares SN1 and SN2 mechanisms, including reaction conditions, substrate structure, solvent effects, nucleophile strength, carbocation formation and stereochemical changes, and distinguishes substitution from elimination.
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