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

Resonance and Mesomerism: NEET previous year questions

2 questions in ten years of NEET, in 2 of 10 papers. Pattern: Now and then. Here is how it is asked and which ideas come back.

Asked in 10 years: 2; about 0.2 per paper
Years asked: 2/10; last asked 2023
Chance of a question next paper: 30%; historical rate, how we compute it
Weighted estimate: 0.1; model; history: 0.2 a paper on average, typically 0–1

Key findings

01
Asked in 2 of 10 papers, 2 questions in all: #186 of 204 topics by ten-year total. It comes back every 5.0 years on average. Last asked in 2023.
02
100% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
03
No idea in this topic has been asked twice: every question tested something new.
04
NEET has asked 2 of the 80 ideas in this topic; 71 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (100%); 0% easy, 50% hard.

Questions per year

Up to 2023: 0.3; per paper
Since 2024: 0.0; -0.3
Usual gap: 5.0 yrs; between papers asking it
Swing: ±0.4; questions, year to year

How it is asked

Difficulty, format and skill

Across all 2 questions on Resonance and Mesomerism since 2017.

Difficulty

QUESTIONS

Easy0 · 0%
Medium1 · 50%
Hard1 · 50%

Format

One-line MCQ · 2 Q100%

Skill tested

Calculation · 1 Q50%
Concept · 1 Q50%

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. 71 have never been asked yet.

Asked directly2 · 3%
Touched inside another question7 · 9%
Never asked71 · 89%

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

1 · 50%50%1/10
- 2018 · Q64
  Which of the following carbocations is expected to be most stable ?
  hardOne-line MCQNew idea
1 · 50%50%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

2 different ideas were tested; none came more than once.

Non-Participating Lone Pair in Pyridine1×
numerical
One-line MCQ · 4% next
Arenium Ion (Wheland Intermediate) Stability1×
most stable carbocation among structures
One-line MCQ · 4% next

Idea	Years asked	Times	Format	Chance next	Foundation for
Non-Participating Lone Pair in Pyridinenumerical		1	One-line MCQCalculation	4%	–
Arenium Ion (Wheland Intermediate) Stabilitymost stable carbocation among structures		1	One-line MCQConcept	4%	–

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

Resonance and Mesomerism questions, year by year

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

NEET 20231 question

Q73
The number of $\sigma$ bonds, $\pi$ bonds and lone pair of electrons in pyridine, respectively are :
Idea: Non-Participating Lone Pair in Pyridine
New ideaMediumOne-line MCQ

NEET 20181 question

Q64
Which of the following carbocations is expected to be most stable ?
Idea: Arenium Ion (Wheland Intermediate) Stability
New ideaHardOne-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.