General Organic Chemistry (GOC) is the foundation of every Organic chapter in NEET. If you understand why one carbocation is more stable than another, half of Organic Chemistry stops being memorisation. This GOC NEET PYQ analysis shows the question types NTA repeats, the orders you must know, and the traps that cost marks.
For how mechanisms build on these ideas, see our organic mechanisms guide. This article focuses on what past papers actually ask.
Want to test yourself first? Solve the Organic Chemistry: Some Basic Principles and Techniques PYQs for free, then use this guide to fix the gaps.
Table of Contents
Why GOC Decides Your Organic Score
NEET usually asks two to three questions from this chapter, which NCERT calls “Organic Chemistry: Some Basic Principles and Techniques”. In the NMC syllabus, it is split into two units: basic principles, and purification and characterisation.
Beyond its own questions, GOC explains reactivity in Hydrocarbons, Haloalkanes, Alcohols and Amines. See every unit in our full Chemistry chapter list, and check the NEET 2027 chapter weightage.
GOC NEET PYQ Analysis: The Repeated Question Types
When you sort a decade of NEET chemistry PYQs from this chapter, five question types cover almost everything.
| Question type | Frequency | What it tests |
|---|---|---|
| Stability of intermediates | Most frequent | Carbocations, carbanions and free radicals |
| Acidity and basicity orders | Very frequent | Effect of substituents on acids and amines |
| Electronic effects | Very frequent | Inductive, resonance and hyperconjugation |
| IUPAC naming and isomerism | Regular | Correct names, types of isomers |
| Purification and analysis | Regular | Lassaigne’s test, Kjeldahl, distillation methods |
For a quick warm-up before the full set, try these five quick GOC practice questions.
Electronic Effects: The Three You Must Know
- Inductive effect: electron shift along sigma bonds. Groups like –NO₂, –CN, –COOH and halogens pull electrons (−I). Alkyl groups push electrons (+I). It weakens quickly with distance.
- Resonance effect: delocalisation of π electrons or lone pairs. –OH and –NH₂ donate electrons (+R), while –NO₂ and –CHO withdraw them (−R).
- Hyperconjugation: delocalisation of C–H sigma electrons. More α-hydrogens means more stability.
When effects compete, resonance usually outweighs the inductive effect. Electron counting here follows the same logic as in our Chemical Bonding PYQ patterns article.
Carbocation Stability and Other Intermediates
| Intermediate | Stability order |
|---|---|
| Carbocation | 3° > 2° > 1° > CH₃⁺ |
| Free radical | 3° > 2° > 1° > CH₃• |
| Carbanion | CH₃⁻ > 1° > 2° > 3° |
Carbocation stability rises with more alkyl groups, because of +I and hyperconjugation. Carbanions follow the opposite order, since alkyl groups add electron density to a carbon that is already negative.
Benzyl and allyl carbocations are extra stable due to resonance. These intermediates return in every mechanism, as our named reactions revision list shows. To count hyperconjugative structures, count the α-hydrogens: the tert-butyl carbocation has 9, and the isopropyl carbocation has 6.
Acidity and Basicity Orders
Acidity
- Carboxylic acid > phenol > water > alcohol
- Electron-withdrawing groups increase acid strength: Cl₃CCOOH > Cl₂CHCOOH > ClCH₂COOH > CH₃COOH
- For halogens: FCH₂COOH > ClCH₂COOH > BrCH₂COOH
- HCOOH is stronger than CH₃COOH
- Nitrophenols are more acidic than phenol, and cresols are less acidic
Basicity
- Aliphatic amines > ammonia > aniline
- In water, for methyl amines: (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃
- Aniline is a weak base because the nitrogen lone pair is delocalised into the ring
Purification and Analysis: Quick Facts
- Lassaigne’s test: nitrogen gives a Prussian blue colour; sulphur gives a violet colour with sodium nitroprusside.
- Kjeldahl’s method estimates nitrogen, but it does not work for nitro compounds, azo compounds or nitrogen in a ring (such as pyridine).
- Steam distillation suits compounds that are steam volatile and immiscible with water, such as aniline.
- Distillation under reduced pressure suits liquids that decompose near their boiling point, such as glycerol.
Worked PYQ-Pattern Questions
Q1. Which carbocation is the most stable? (a) CH₃⁺ (b) CH₃CH₂⁺ (c) (CH₃)₂CH⁺ (d) (CH₃)₃C⁺
Answer: (d). The tertiary carbocation has the most alkyl groups and 9 α-hydrogens.
Q2. Which is the strongest acid? (a) CH₃COOH (b) ClCH₂COOH (c) Cl₂CHCOOH (d) Cl₃CCOOH
Answer: (d). Three chlorine atoms give the strongest −I effect and stabilise the anion most.
Q3. How many hyperconjugative structures are possible for the isopropyl carbocation?
Answer: 6. It has six α-hydrogens, three on each methyl group.
Q4. Kjeldahl’s method cannot be used to estimate nitrogen in: (a) Aniline (b) Urea (c) Nitrobenzene (d) Glycine
Answer: (c) Nitrobenzene. Nitrogen in a nitro group is not converted to ammonium sulphate.
Q5. Which is the strongest base in aqueous solution? (a) NH₃ (b) CH₃NH₂ (c) (CH₃)₂NH (d) C₆H₅NH₂
Answer: (c) (CH₃)₂NH. It has the best balance of +I effect, solvation and steric factors.
Common Traps in This Chapter
- Using the carbocation order for carbanions
- Ranking (CH₃)₃N as the strongest methyl amine in water
- Ignoring distance when comparing inductive effects
- Forgetting that resonance usually beats the inductive effect
- Applying Kjeldahl’s method to nitro or ring-nitrogen compounds
Practise Every GOC PYQ
This GOC NEET PYQ analysis gives you the orders and the reasoning behind them. Practice makes them automatic. Every previous year question from this chapter is available chapter-wise, free:
For every “arrange in order” question, write the effect at work (+I, −I, +R, −R or hyperconjugation) beside each option before you rank them.
Conclusion
GOC is about reasons, not lists. Use this GOC NEET PYQ analysis to master electronic effects, the stability of intermediates and the acidity and basicity orders. Then practise until you can explain every order in one line. That skill carries through all of Organic Chemistry.
❓ FAQ
Q: How many questions come from GOC in NEET? A: Usually two to three questions, and its concepts are used in almost every other Organic Chemistry question.
Q: What is the full form of GOC? A: GOC stands for General Organic Chemistry. In NCERT, the chapter is called “Organic Chemistry: Some Basic Principles and Techniques”.
Q: Which carbocation is the most stable? A: Among simple alkyl carbocations, the tertiary one is the most stable. Benzyl and allyl carbocations gain extra stability from resonance.
Q: Why is aniline less basic than ammonia? A: In aniline, the lone pair on nitrogen is delocalised into the benzene ring, so it is less available to accept a proton.
Q: How should I revise GOC for NEET? A: Use a GOC NEET PYQ analysis to list the repeated orders, learn the reason behind each one, and solve past questions chapter-wise.
Q: Where can I practise GOC NEET PYQs for free? A: You can solve every previous year question from this chapter for free using the practice link in this article.