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

Electronic Effects: NEET previous year questions

4 questions in ten years of NEET, in 4 of 10 papers. Pattern: Most years. Here is how it is asked and which ideas come back.

Asked in 10 years: 4; about 0.4 per paper
Years asked: 4/10; last asked 2026
Chance of a question next paper: 50%; historical rate, how we compute it
Weighted estimate: 0.5; model; history: 0.4 a paper on average, typically 0–1

Key findings

01
Asked in 4 of 10 papers, 4 questions in all: #162 of 204 topics by ten-year total. It comes back every 2.7 years on average.
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 4 of the 83 ideas in this topic; 75 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (100%); 25% easy, 0% hard, and up from 0.3 to 0.6 questions a paper since 2024.

Questions per year

Up to 2023: 0.3; per paper
Since 2024: 0.6; +0.4
Usual gap: 2.7 yrs; between papers asking it
Swing: ±0.5; questions, year to year

How it is asked

Difficulty, format and skill

Across all 4 questions on Electronic Effects since 2017.

Difficulty

QUESTIONS

Easy1 · 25%
Medium3 · 75%
Hard0 · 0%

Format

One-line MCQ · 4 Q100%

Skill tested

Concept · 3 Q75%
Recall · 1 Q25%

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 4 of the 83 ideas in this topic. 75 have never been asked yet.

Asked directly4 · 5%
Touched inside another question4 · 5%
Never asked75 · 90%

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 · 25%25%1/10
- 2018 · Q65
  Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
  mediumOne-line MCQNew idea
1 · 25%25%1/10
1 · 25%25%1/10
1 · 25%25%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

4 different ideas were tested; none came more than once. Hyperconjugation Stability is the foundation for 24 other ideas in the syllabus.

Orbital Overlap in Hyperconjugation1×
identify orbitals stabilising a carbocation
One-line MCQ · 6% next
Intermediate Stability1×
order/ranking of carbocation stability
One-line MCQ · 6% next · foundation for 2
Hyperconjugation Stability1×
reason for relative stability
One-line MCQ · 4% next · foundation for 24
Halogen -I Effect Series1×
order/ranking of -i effect
One-line MCQ · 4% next

Idea	Times	Format	Chance next	Foundation for
Orbital Overlap in Hyperconjugationidentify orbitals stabilising a carbocation	1	One-line MCQConcept	6%	–
Intermediate Stabilityorder/ranking of carbocation stability	1	One-line MCQConcept	6%	2 ideas
Hyperconjugation Stabilityreason for relative stability	1	One-line MCQConcept	4%	24 ideas
Halogen -I Effect Seriesorder/ranking of -i effect	1	One-line MCQRecall	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

Electronic Effects questions, year by year

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

NEET 20261 question

Q48
The following carbocation is stabilized by the interaction of the empty p orbital with [Structure: $\mathrm{C_6H_5-\overset{+}{C}H-CH_3}$ ]
Idea: Orbital Overlap in Hyperconjugation
New ideaMediumOne-line MCQ · figure

NEET 20241 question

Q80
The most stable carbocation among the following is:
Idea: Intermediate Stability
New ideaMediumOne-line MCQ · figure

NEET 20201 question

Q112
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?
Idea: Hyperconjugation Stability
New ideaEasyOne-line MCQ

NEET 20181 question

Q65
Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
Idea: Halogen -I Effect Series
New ideaMediumOne-line MCQ

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