Organic Chemistry: Some Basic Principles and Techniques carries 3.0 of 100 Chemistry marks in NEET by past-paper share: 21 of the 707 tagged NEET Chemistry PYQs in the ViJEEta bank (NEET 2013–2026). It ranks 18 of 26 Chemistry chapters.
How the weight is computed: this chapter's tagged NEET PYQs divided by all tagged NEET Chemistry PYQs in the bank (21 of 707), times 100, with repeated questions counted once. The bank does not store the year of each NEET question, so none is printed. Computed from the bank at build time. Updated 19 Oct 2026.
14 formulas, each with when to use it. Copy it onto one page of your notebook: that page is this chapter's handbook.
Use it when: a combustion problem gives you the gain in mass of the tube
Use it when: the same combustion gives the gain in mass of the anhydrous tube
Use it when: is absorbed in mL of molar and the leftover acid takes mL of molar
Use it when: is collected at room temperature and pressure and you need its STP volume
Use it when: the gas is collected over aqueous , so water vapour is mixed with it
Use it when: you have the STP volume and need the percentage, since mL of at STP weighs g
Use it when: g of , or forms from g of compound (, )
Use it when: is oxidised to and precipitated as with
Use it when: a TLC or paper chromatogram question gives spot and solvent-front distances
Use it when: asked why the mixture boils below , because it boils once the two vapour pressures add up to atmospheric pressure
Use it when: is weighed as (molar mass g)
Use it when: is precipitated with magnesia mixture and ignited, because one ( u) holds two atoms ()
Use it when: no oxygen data is given, which is the usual case
Use it when: is turned into over red-hot coke and then oxidised by , so each mole of ends up as mol
In Dumas, students put the barometer reading straight into the STP formula. Subtract the aqueous tension first. Also, Kjeldahl cannot be used for nitro, azo or ring nitrogen (like pyridine), so never apply formula 3 to those compounds.
3 real previous-year questions from this chapter, as printed in the paper, each with its worked solution. Answer the first one here with no sign-in.
Correct answer: Option C
Correct answer: Option B
Correct answer: Option D
The 12 busiest of 26 topics, by tagged PYQs, then practice questions. Counted from the bank. Updated 19 Oct 2026.
| Topic | PYQs | Practice questions |
|---|---|---|
| Introduction of Reaction Intermediates | 4 | 87 |
| IUPAC System of Nomenclature | 3 | 79 |
| Concept of Aromaticity | 2 | 55 |
| Conformational Isomerism | 2 | 39 |
| Classification of Organic Compounds | 2 | 10 |
| Applications of Electronic Effects | 1 | 82 |
| Resonance | 1 | 41 |
| Hyperconjugation | 1 | 38 |
| Inductive Effect | 1 | 33 |
| Structural Isomerism | 1 | 23 |
| Reacting Species | 1 | 8 |
| Electronic Displacement in a Covalent Bond | 1 | 5 |
Unknown is not zero. Until you answer at least 3 graded questions in Organic Chemistry: Some Basic Principles and Techniques, ViJEEta shows – instead of a zero or a 50% default. Book exercises can raise chapter mastery up to 0.60, adaptive practice up to 0.75, and only a timed chapter test or mock can certify 0.80 and above.
Every chapter test is 25 questions. It starts at moderate difficulty and adapts after each saved answer. If you open a solution before answering, that attempt earns no credit, so your mastery stays honest.
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