Question
Download Solution PDFFor an E2 reaction, which of the following is correct?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
E2 Reaction and Leaving Group Ability
- An E2 reaction is a bimolecular elimination reaction where the rate depends on both the substrate and the base.
- The leaving group plays a critical role in E2 reactions. A better leaving group facilitates the elimination process.
- The ability of a halide to act as a leaving group increases with its size and polarizability. In general, the order of leaving group ability for halogens is:
Iodine (I) > Bromine (Br) > Chlorine (Cl)
EXPLANATION:
- In the given options, the reactivity order for an E2 reaction depends on the leaving group ability of the halides (R-Cl, R-Br, R-I).
- Among halogens:
- Iodine is the largest and most polarizable, making it the best leaving group.
- Bromine is less polarizable than iodine but better than chlorine.
- Chlorine is the smallest and least polarizable, making it the poorest leaving group.
Therefore, the correct answer is Option 3: R-Cl < R-Br < R-I.
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