NEET UG · Chemistry · Class 11

Organic Chemistry - Some Basic Principles and Techniques: NEET previous year questions

22 questions in ten years of NEET, asked in 10 of 10 years. Here is what this chapter tests and how.

Asked in 10 years: 22; 10 of 10 papers
10-year average: 2.1; a paper · 2.6 since 2024 +0.6
Typical range: 1–3; questions a paper; fewest 1, most 3
Weighted estimate: 2.4; model, recent papers count more · about 9 marks

Typical range (fact)
10-year average (fact)
Weighted estimate (model)

Typical range: questions per paper in the middle eight of the ten papers, leaving out the single highest and lowest year (about the 10th to 90th percentile), each paper scaled to 180 questions. The ten-year average and the range are historical fact. The weighted estimate is a model: each paper's share, with recent papers counting more (half-life three years), and dropped syllabus removed. It is a guide to effort, not a forecast.

What to do

How to spend time on Organic Chemistry - Some Basic Principles and Techniques

Priority

Should do

Among the chapters that took NEET from half to 80% of its questions. How bands are set

Past questions: 22in 10 of 10 papers
Study plan gives it: 18 hover 12 months; 13 h over 6

Study this chapter →

Ideas asked most often

Types of Distillation2×
Lassaigne's Test for N and Halogens2×
Alphabetical Branch Naming2×
Hybridisation and Sigma/Pi Bonds in Organic Molecules2×

220 of the 243 ideas in Lumi’s map of this chapter have not been asked or touched in ten years. New questions often come from ideas like these, so learn the whole chapter, not just the list above.

Questions per year

Kind of question

SHARE OF 10 YEARS

Recall36%
Application27%
Concept18%
Calculation14%
Match the lists5%

Most common asks: identify compound giving test (2); identify molecule with given hybridisation order (1); identify compound from structural description (1).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all NEET chapters: #31; of 80 by weighted estimate
Rank in Chemistry: #7; of 21 chapters
Share of the paper: 1.2%; ten-year average
Busiest year: 2017; 3 questions
Year to year: Steady; varies by about 0.8 questions
Long-run direction: -0.00; questions per paper, per year
Easy questions: 41%; 86% of ideas rated hard
With a figure: 27%; graph, diagram or structure
Study time: 18 h; 13 h on a 6-month plan
Marks per study hour: 0.51; #61 of 80 chapters
Foundation for others: 49%; of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard against NCERT.

20173
20183
20191
20202
20211
20222
20232
20243
20253
20262

Easy
Medium
Hard

What it asks you to do

SHARE OF QUESTIONS

Recall41%
Application27%
Concept18%
Calculation9%
Multi-step5%

Coverage

How much of the chapter NEET has used

We split the chapter into 243 ideas. In ten years NEET built a question around 8 of them. Most of the chapter has never been asked, which is why learning it whole beats memorising past questions.

Asked as the main idea: 8
Touched on in a question: 15
Never asked: 220

Topics

What repeats, topic by topic

Questions per topic in each year's paper. Topics that come every year are worth learning first.

Purification, Analysis and Isomerism of Organic Compounds · Every year11
21111131
Organic Nomenclature · Every year5
11111
Electronic Effects · Most years4
1111
Resonance and Mesomerism · Now and then2
11

’17’18’19’20’21’22’23’24’25’26

Topic	2017	’18	2019	’20	2021	’22	2023	’24	2025	’26	Total
Purification, Analysis and Isomerism of Organic CompoundsEvery year	2	·	·	1	1	1	1	1	3	1	11
Organic NomenclatureEvery year	1	1	1	·	·	1	·	1	·	·	5
Electronic EffectsMost years	·	1	·	1	·	·	·	1	·	1	4
Resonance and MesomerismNow and then	·	1	·	·	·	·	1	·	·	·	2

03+questions in that year’s paper

Purification, Analysis and Isomerism of Organic Compounds
Expect a one-line factual recall item about Purification, Analysis and Isomerism of Organic Compounds. Past framings centre on: identify compound giving test; classify technique by type.

Drill down

Topic, idea, question

Open a topic to see every idea NEET tested inside it, then open an idea to read the questions. Each row shows its ten papers.

topicAskedShareYears’17’18’19’20’21’22’23’24’25’26

Open11 · 50%50%8/1023
9 ideas inside
- Repeated2 · 18%18%2/10
- Repeated2 · 18%18%2/10
- 1 · 9%9%1/10
- 1 · 9%9%1/10
- 1 · 9%9%1/10
- 1 · 9%9%1/10
- 1 · 9%9%1/10
- 1 · 9%9%1/10
- 1 · 9%9%1/10
Open5 · 23%23%5/10
Open4 · 18%18%4/10
Open2 · 9%9%2/10

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

The exact ideas NEET has asked

Inside the topics, 18 different ideas were tested. These came more than once, or are new since 2024.

Types of Distillation2×
choose separation method for isomers
Lassaigne's Test for N and Halogens2×
identify compound giving test
Alphabetical Branch Naming2×
iupac name of substituted chain
Hybridisation and Sigma/Pi Bonds in Organic Molecules2×
identify molecule with given hybridisation order
Orbital Overlap in HyperconjugationNew1×
identify orbitals stabilising a carbocation
Lassaigne's Test for SulphurNew1×
identify compound giving test
Counting IsomersNew1×
count isomers of given formula
Intermediate StabilityNew1×
order/ranking of carbocation stability
Purification TechniquesNew1×
identify technique by principle

Idea	Times	Usually asked as
Types of Distillationchoose separation method for isomers	2	Match the lists
Lassaigne's Test for N and Halogensidentify compound giving test	2	One-line MCQ
Alphabetical Branch Namingiupac name of substituted chain	2	One-line MCQ
Hybridisation and Sigma/Pi Bonds in Organic Moleculesidentify molecule with given hybridisation order	2	One-line MCQ
Orbital Overlap in Hyperconjugationidentify orbitals stabilising a carbocation	1	One-line MCQNew
Lassaigne's Test for Sulphuridentify compound giving test	1	One-line MCQNew
Counting Isomerscount isomers of given formula	1	One-line MCQNew
Intermediate Stabilityorder/ranking of carbocation stability	1	One-line MCQNew
Purification Techniquesidentify technique by principle	1	One-line MCQNew

Every question

Organic Chemistry - Some Basic Principles and Techniques questions, year by year

The opening words of each question as it appeared in the official paper.

NEET 20262 questions

Q48The following carbocation is stabilized by the interaction of the empty p orbital with [Structure: $\mathrm{C_6H_5-\overset{+}{C}H-CH_3}$ ]One-line MCQ · figure
Q55The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside isOne-line MCQ

NEET 20253 questions

Q72Match List I with List II List I (Mixture) | List II (Method of Separation) A. $CHCl_3 + C_6H_5NH_2$ | I. Distillation under reduced…Match the lists
Q86Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $C_4H_8O$ is :One-line MCQ
Q90Which one of the following reactions does NOT belong to “Lassaigne's test”?One-line MCQ

NEET 20243 questions

Q51A compound with a molecular formula of C $_6$ H $_{14}$ has two tertiary carbons. Its IUPAC name is:One-line MCQ
Q80The most stable carbocation among the following is:One-line MCQ · figure
Q83On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the…One-line MCQ

NEET 20232 questions

Q54In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe $^{3+}$ due to…One-line MCQ
Q73The number of $\sigma$ bonds, $\pi$ bonds and lone pair of electrons in pyridine, respectively are :One-line MCQ

NEET 20222 questions

Q55The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following…One-line MCQ · figure
Q89The correct IUPAC name of the following compound is : [structure: $\mathrm{CH_3CH(Cl)CH(CH_3)CH(OH)CH_2CH_2Br}$ ]One-line MCQ · figure

NEET 20211 question

Q53The compound which shows metamerism is :One-line MCQ

NEET 20202 questions

Q108Paper chromatography is an example of :One-line MCQ
Q112A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?One-line MCQ

NEET 20191 question

Q46The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is :One-line MCQ

NEET 20183 questions

Q63Which of the following molecules represents the order of hybridisation $sp^2$ , $sp^2$ , sp, sp from left to right atoms ?One-line MCQ
Q64Which of the following carbocations is expected to be most stable ?One-line MCQ · figure
Q65Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)One-line MCQ

NEET 20173 questions

Q70The correct statement regarding electrophile is :One-line MCQ
Q78The most suitable method of separation of 1 : 1 mixture of ortho and para - nitrophenols is :One-line MCQ
Q89The IUPAC name of the compound $\mathrm{OHC-CH(CH_3)-CO-CH=CH-CH_3}$ isOne-line MCQ · figure

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.

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