Which of the following alkyl halides cannot be prepared by the direct halogenation of alkanes?
Correct answer: C. R - I
- A. R - CI
- B. R - Br
- C. R - I
- D. R - F
Explanation
Alkyl iodides can't be prepared by direct halogenation of alkanes because iodine is a weaker halogen compared to chlorine, bromine, and fluorine. The reaction between alkanes and iodine is not as favorable. Therefore, option c 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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