alleryReactivity of haloalkanes in SN2 by leaving group:
AI > Br > Cl > F (iodide is best leaving group; F⁻ is poor)
BF best
CAll same
DF > Cl
Answer & Solution
Correct answer: A. I > Br > Cl > F (iodide is best leaving group; F⁻ is poor)
**Leaving group ability in SN2:** better LG = lower basicity (weak conjugate base = stable).
I⁻ (weak base) is best LG, F⁻ is poor (F⁻ basicity higher in some media).
**Hence R-I > R-Br > R-Cl > R-F in SN2 reactivity.**
Keep practising Haloalkanes and Haloarenes
Browse all Haloalkanes and Haloarenes questions for AP Intermediate 2nd Year, or explore more Chemistry topics.
Related questions
As per your syllabus, the STAGGERED form of ethane is more stable than ECLIPSED for which As per your syllabus, Mechanism, the FIRST step of methane chlorination under sunlight is As per your syllabus, the rate of substitution of HYDROGENS in alkane halogenation goes inAs per your syllabus, the rate of HALOGENATION of alkanes (F₂, Cl₂, Br₂, I₂) decreases in As per your syllabus, (ii), in Kolbe electrolytic synthesis of alkanes, the alkane gas is As per your syllabus, (i), heating CH₃COONa with NaOH + CaO (soda-lime) produces which gasAs per your syllabus, (ii), the Wurtz reaction uses which reagent + solvent for coupling aAs per your syllabus, + Fig 9.1, the H-C-H bond angle in methane and the carbon hybridisat