Haloalkanes and Haloarenes Class 12 Chemistry Notes – Formulas & Quick Revision

Haloalkanes and Haloarenes organic ka reaction-mechanism chapter hai — SN1/SN2 aur elimination yahan core hain. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.

Important Formulas & Concepts — Haloalkanes and Haloarenes

• SN2: one step, inversion, 1° > 2° > 3°, strong nucleophile
• SN1: two steps (carbocation), racemisation, 3° > 2° > 1°, polar protic solvent
• Zaitsev rule: elimination mein zyada substituted alkene major
• Finkelstein: R−Cl + NaI/acetone → R−I
• Swarts: R−Cl + AgF → R−F
• Wurtz: 2R−X + 2Na → R−R
• Grignard: R−X + Mg/dry ether → RMgX
• Aryl halides SN mein unreactive (partial double bond character)

Quick Revision Points

• SN1 mein carbocation rearrangement ho sakta hai
• Chirality: SN2 inversion (Walden), SN1 racemisation
• Haloarenes ki nucleophilic substitution mushkil — electron withdrawing groups (NO₂) se possible
• DDT, chloroform, iodoform ke environmental effects
• KCN se nitrile (C-attack), AgCN se isocyanide (N-attack)

FAQ

SN1 vs SN2 kaise decide karu?

Substrate (1°/3°), nucleophile strength aur solvent — PDF ki decision table ek nazar mein clear kar deti hai.

Mechanisms likhne aate hain boards mein?

Haan — SN1/SN2 mechanism steps ke saath PDF mein diye hain.

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