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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumMulti-step

JEE Main 7 April 2025, Shift 1, Chemistry Q66

Question 66 of 75 in this shift, Chemistry question 16 of 25, Section A.

The reactions which cannot be applied to prepare an alkene by elimination, are A. [2-bromo-1-methylcyclohexane: cyclohexane ring with a methyl group and an adjacent Br] →NaOEt\xrightarrow{\mathrm{NaOEt}} B. CH3−CH2−CH(Br)−CH3→KOH (aq)\mathrm{CH_3-CH_2-CH(Br)-CH_3} \xrightarrow{\mathrm{KOH\ (aq)}} C. (CH3)3C−Br→NaOMe\mathrm{(CH_3)_3C-Br} \xrightarrow{\mathrm{NaOMe}} D. [phenol, C6H5−OH\mathrm{C_6H_5-OH}] →H2SO4Na2Cr2O7\xrightarrow[\mathrm{H_2SO_4}]{\mathrm{Na_2Cr_2O_7}} E. (CH3)3C−OH→573 KCu\mathrm{(CH_3)_3C-OH} \xrightarrow[573\ \mathrm{K}]{\mathrm{Cu}} Choose the correct answer from the options given below:

The figure, in words

Reaction scheme with five reactions A-E. A: cyclohexane ring bearing a methyl group and an adjacent bromine, reagent NaOEt. B: 2-bromobutane, KOH (aq). C: tert-butyl bromide, NaOMe. D: phenol, Na2Cr2O7/H2SO4. E: tert-butyl alcohol, Cu at 573 K.
  1. (1)A, C & D Only
  2. (2)B & E Only
  3. (3)B & D OnlyOfficial answer
  4. (4)B, C & D Only

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.