Arrange the following compounds in the order of leaving group ability:
Correct answer: B. IV > III > I > II
- A. I > II > III > IV
- B. IV > III > I > II
- C. III > II > I > IV
- D. II > III > IV > I
Explanation
Weaker the base, better is the leaving group. Hence, basicities decrease in the order. Therefore, the order of leaving group ability decreases in the reverse order (IV) > (III) > (I) > (II). Hence, (b) is the correct answer.
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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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