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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 1 February 2024, Shift 1, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

Identify A and B in the following sequence of reaction [toluene: benzene ring with CH3\mathrm{CH_3}] →Cl2/hν\xrightarrow{\mathrm{Cl_2/h\nu}} A →373 KH2O\xrightarrow[373\ \mathrm{K}]{\mathrm{H_2O}} B

The figure, in words

Toluene (benzene ring bearing CH3) treated with Cl2/hv gives A, then H2O at 373 K gives B; options draw A and B as substituted benzene rings.
  1. (1)A = [benzene ring with CH2Cl\mathrm{CH_2Cl}], B = [benzene ring with CHO\mathrm{CHO}]
  2. (2)A = [benzene ring with COCl\mathrm{COCl}], B = [benzene ring with CHO\mathrm{CHO}]
  3. (3)A = [benzene ring with CHCl2\mathrm{CHCl_2}], B = [benzene ring with CHO\mathrm{CHO}]Official answer
  4. (4)A = [benzene ring with CHCl2\mathrm{CHCl_2}], B = [benzene ring with COOH\mathrm{COOH}]

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 108 of the 174 JEE Main shifts held from 2017 to 2026.