Quick answer: GOC is the grammar of organic chemistry. If you know the four electronic effects and the stability orders, mechanisms in Class 12 become predictable instead of memorised.
Electronic effects
| Effect | What it is | Order / examples |
|---|---|---|
| Inductive (I) | Permanent σ-bond polarisation | −I: −NO₂ > −CN > −COOH > −F > −Cl > −Br > −I; +I: alkyl groups (3° > 2° > 1°) |
| Resonance (R/M) | Delocalisation of π/lone pairs | +R: −OH, −NH₂, −OR, −Cl (weak); −R: −NO₂, −CHO, −COOH, −CN |
| Hyperconjugation | σ(C–H) → empty p / π | More α-H → more stable (3° carbocation, propene > ethene) |
| Electromeric | Temporary, in presence of a reagent | Complete transfer of π electrons |
Stability orders
- Carbocation: benzyl ≈ allyl > 3° > 2° > 1° > CH₃⁺; stabilised by +I, +R, hyperconjugation
- Carbanion: CH₃⁻ > 1° > 2° > 3°; stabilised by −I, −R
- Free radical: same order as carbocation
- Tropylium cation and cyclopropenyl cation are aromatic → very stable
Acidity and basicity
- Acidity: electron-withdrawing groups increase; phenol > alcohol; picric acid > o-nitrophenol > phenol; carboxylic acid > phenol > alcohol
- Basicity in gas phase: 3° > 2° > 1° amine; in water: 2° > 1° > 3° (methyl) due to solvation; aniline < NH₃ (lone pair in resonance)
Aromaticity (Hückel)
- Planar, cyclic, fully conjugated, (4n + 2) π electrons: benzene (6), pyrrole (6, lone pair counted), pyridine (6, lone pair not counted), cyclopentadienyl anion (6)
- Anti-aromatic: 4n electrons and planar (cyclobutadiene)
Reaction intermediates
- Carbocation: SN1, E1, electrophilic addition — watch for rearrangements (hydride/methyl shift)
- Carbanion: aldol, Claisen, Grignard
- Free radical: halogenation of alkanes, anti-Markovnikov HBr with peroxide
- Carbene: :CH₂ in cyclopropanation
Common mistakes
- Counting the lone pair of pyridine’s N as part of the aromatic sextet
- Forgetting rearrangement in carbocation reactions
- Applying the gas-phase basicity order in aqueous questions
Related: Chemical bonding tricks.
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Frequently asked questions
Is this Organic Chemistry Basics content at JEE/NEET level?
Yes. It covers the formulas, facts and question types that appear in JEE Main, JEE Advanced and NEET, with the NCERT base that these exams follow.
How many questions come from Organic Chemistry Basics?
Typically one to three questions per paper, depending on the year. Check the chapter-wise weightage post and give this topic time in proportion.
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