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Friday, 9 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 8 April 2023, Shift 2, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

The product (P) formed from the following multistep reaction is: [reaction: 4-nitrotoluene (benzene ring with NO2\mathrm{NO_2} and CH3\mathrm{CH_3} para to each other) →(i) Br2; (ii) H2/Pd; (iii) NaNO2, HCl, 0∘C; (iv) H3PO2\xrightarrow{\text{(i) } Br_2;\ \text{(ii) } H_2/Pd;\ \text{(iii) } NaNO_2,\ HCl,\ 0^\circ C;\ \text{(iv) } H_3PO_2} (P) Product]

The figure, in words

Stem is a reaction scheme: 4-nitrotoluene with four sequential reagent steps; options are four substituted benzene ring structures
  1. (1)[structure: 2-bromotoluene, Br on the carbon adjacent to the CH3\mathrm{CH_3}-bearing carbon]Official answer
  2. (2)[structure: 3-bromotoluene, Br meta to CH3\mathrm{CH_3}]
  3. (3)[structure: benzene ring with CH3\mathrm{CH_3}, OH and Br; OH and Br adjacent, CH3\mathrm{CH_3} para to OH]
  4. (4)[structure: benzene ring with CH3\mathrm{CH_3}, OH and Br; Br adjacent to CH3\mathrm{CH_3}, OH para to CH3\mathrm{CH_3}]

Official answer

Option 1

NTA final key.

Chapter
Amines