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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 25 February 2021, Shift 2, Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30, Section A.

The correct order of bond dissociation enthalpy of halogens is :
  1. (1)F2\mathrm{F_2}>>Cl2\mathrm{Cl_2}>>Br2\mathrm{Br_2}>>I2\mathrm{I_2}
  2. (2)I2\mathrm{I_2}>>Br2\mathrm{Br_2}>>Cl2\mathrm{Cl_2}>>F2\mathrm{F_2}
  3. (3)Cl2\mathrm{Cl_2}>>Br2\mathrm{Br_2}>>F2\mathrm{F_2}>>I2\mathrm{I_2}Official answer
  4. (4)Cl2\mathrm{Cl_2}>>F2\mathrm{F_2}>>Br2\mathrm{Br_2}>>I2\mathrm{I_2}

Official answer

Option 3

NTA final key.

Chapter
The p-Block Elements
Topic
Group 17 & 18
Idea tested
Halogen Reactivity Trends

Same idea in other shifts

Asked 3× in all
  1. 2 Apr 2026, Shift 1 · Q60Given below are two statements : Statement (I) : Oxidising power of halogens decreases in the order F2>Cl2>Br2>I2\mathrm{F_2>Cl_2>Br_2>I_2}, which is…MediumTwo statements
  2. 26 Aug 2021, Shift 1 · Q38The incorrect statement is :MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.