NEET UG · Chemistry · Organic Chemistry - Some Basic Principles and Techniques

Organic Nomenclature: NEET previous year questions

5 questions in ten years of NEET, in 5 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 5; about 0.5 per paper
Years asked: 5/10; last asked 2024
Chance of a question next paper: 37%; historical rate, how we compute it
Weighted estimate: 0.3; model; history: 0.5 a paper on average, typically 0–1

Key findings

01
Asked in 5 of 10 papers, 5 questions in all: #153 of 204 topics by ten-year total. It comes back every 1.8 years on average. Last asked in 2024.
02
50% of its questions since 2018 tested an idea never asked before; 1 repeated an idea from the year before.
03
The most repeated idea is Alphabetical Branch Naming, asked 2 times (2022, 2024), usually as “iupac name of substituted chain”.
04
NEET has asked 2 of the 80 ideas in this topic; 74 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (100%); 40% easy, 0% hard.

Questions per year

Up to 2023: 0.6; per paper
Since 2024: 0.3; -0.3
Usual gap: 1.8 yrs; between papers asking it
Swing: ±0.5; questions, year to year

How it is asked

Difficulty, format and skill

Across all 5 questions on Organic Nomenclature since 2017.

Difficulty

QUESTIONS

Easy2 · 40%
Medium3 · 60%
Hard0 · 0%

Format

One-line MCQ · 5 Q100%

Skill tested

Application · 4 Q80%
Calculation · 1 Q20%

Repeats

New idea, or one asked before?

Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.

’17’18’19’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier paper

Coverage of the topic

NEET has asked 2 of the 80 ideas in this topic. 74 have never been asked yet.

Asked directly2 · 3%
Touched inside another question4 · 5%
Never asked74 · 93%

Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.

Drill down

Idea, year, question

Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.

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

Repeated2 · 40%40%2/10
- 2024 · Q51
  A compound with a molecular formula of C $_6$ H $_{14}$ has two tertiary carbons. Its IUPAC name is:
  mediumOne-line MCQ
- 2022 · Q89
  The correct IUPAC name of the following compound is : [structure: $\mathrm{CH_3CH(Cl)CH(CH_3)CH(OH)CH_2CH_2Br}$ ]
  mediumOne-line MCQNew idea
Repeated2 · 40%40%2/10
1 · 20%20%1/10

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

Ideas

Every idea inside this topic

3 different ideas were tested; 2 came more than once. Functional Group Priority is the foundation for 28 other ideas in the syllabus.

Alphabetical Branch Naming2×
iupac name of substituted chain
One-line MCQ · 6% next · foundation for 27
Hybridisation and Sigma/Pi Bonds in Organic Molecules2×
identify molecule with given hybridisation order
One-line MCQ · 4% next
Functional Group Priority1×
iupac name of polyfunctional compound
One-line MCQ · 4% next · foundation for 28

Idea	Times	Format	Chance next	Foundation for
Alphabetical Branch Namingiupac name of substituted chain	2	One-line MCQApplication	6%	27 ideas
Hybridisation and Sigma/Pi Bonds in Organic Moleculesidentify molecule with given hybridisation order	2	One-line MCQApplication	4%	–
Functional Group Priorityiupac name of polyfunctional compound	1	One-line MCQApplication	4%	28 ideas

Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas

Every question

Organic Nomenclature questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested.

NEET 20241 question

Q51
A compound with a molecular formula of C $_6$ H $_{14}$ has two tertiary carbons. Its IUPAC name is:
Idea: Alphabetical Branch Naming
MediumOne-line MCQ

NEET 20221 question

Q89
The correct IUPAC name of the following compound is : [structure: $\mathrm{CH_3CH(Cl)CH(CH_3)CH(OH)CH_2CH_2Br}$ ]
Idea: Alphabetical Branch Naming
New ideaMediumOne-line MCQ · figure

NEET 20191 question

Q46
The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is :
Idea: Hybridisation and Sigma/Pi Bonds in Organic Molecules
Asked last yearEasyOne-line MCQ

NEET 20181 question

Q63
Which of the following molecules represents the order of hybridisation $sp^2$ , $sp^2$ , sp, sp from left to right atoms ?
Idea: Hybridisation and Sigma/Pi Bonds in Organic Molecules
New ideaEasyOne-line MCQ

NEET 20171 question

Q89
The IUPAC name of the compound $\mathrm{OHC-CH(CH_3)-CO-CH=CH-CH_3}$ is
Idea: Functional Group Priority
MediumOne-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.