The correct order of increasing reactivity of the following alkyl halides, (I) CH3 CH2 CH2 Cl(II) CH3 CH2 CH2 CH2 Br(III) (CH3 )2 C(Cl)CH2 CH3 (IV) CH3 CH2 CH(Br)CH3 Towards SN 2 displacement is:
Correct answer: B. III < I < IV < II
- A. I < II < III < IV
- B. III < I < IV < II
- C. III < I < II < IV
- D. II < IV < I < III
- E. I < III < II < IV
Explanation
The reactivity of alkyl halides towards SN2 depends on:(i) Degree of C-atoms Reactivity Order:1°>2°>3°(ii)More good the leaving group more will be reactivity of alkyl halide in SN2 since order of leaving group is I>Br>Cl>F Hence, correct order is: III<I<IV<||. Hence option B 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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