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Friday, 9 October

NEET UG 2018 · Chemistry · Question 65

NEET 2018 Chemistry, question 65

Question 65 of the NEET 2018 paper (code AA) is a Chemistry question from Organic Chemistry - Some Basic Principles and Techniques. Its idea, Halogen -I Effect Series, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 3.

Updated 2026-10-08

Q65 · Chemistry

Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)

  1. 1−NH2>−OR>−F-\mathrm{NH_2} > -\mathrm{OR} > -\mathrm{F}
  2. 2−NR2<−OR<−F-\mathrm{NR_2} < -\mathrm{OR} < -\mathrm{F}
  3. 3−NH2<−OR<−F-\mathrm{NH_2} < -\mathrm{OR} < -\mathrm{F}Official answer
  4. 4−NR2>−OR>−F-\mathrm{NR_2} > -\mathrm{OR} > -\mathrm{F}

Official answer: option 3 · CBSE official answer key

Same idea

The only question on Halogen -I Effect Series

No other NEET paper from 2017–2026 tested this exact idea.

Halogen -I Effect Series: every question and how it was framed

The chapter

Organic Chemistry - Some Basic Principles and Techniques in ten years of NEET

22 questions from 2017–2026, asked in 10 of 10 papers, about 2.1 a paper. Electronic Effects alone had 4.

Chapter analysisStudy this chapter

Organic Chemistry - Some Basic Principles and Techniques: questions per paper

0243’173’181’192’201’212’222’233’243’252’26