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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 30 July 2022, Shift 2, Chemistry Q47

Question 47 of 90 in this shift, Chemistry question 17 of 30, Section A.

[figure: six-membered ring with three alternating double bonds bearing N2+Cl−\mathrm{N_2^+Cl^-}, then '+ x' (lowercase x as printed) over a long arrow, to a six-membered ring with three alternating double bonds bearing N2+BF4−\mathrm{N_2^+BF_4^-}; then an arrow with Y above and Cu, Δ\Delta below, to a six-membered ring with three alternating double bonds bearing NO2\mathrm{NO_2}, labelled (Major Product)] Consider the given chemical reaction, identify X and Y

The figure, in words

Two-step scheme; reagents printed: + x, then Y over Cu, delta; ring substituents N2+Cl-, N2+BF4-, NO2.
  1. (1)X=BF3\mathrm{X = BF_3} Y=HNO3\mathrm{Y = HNO_3}
  2. (2)X=HBF4\mathrm{X = HBF_4} Y=NaNO2\mathrm{Y = NaNO_2}Official answer
  3. (3)X=HBF4\mathrm{X = HBF_4} Y=HNO3\mathrm{Y = HNO_3}
  4. (4)X=BF3\mathrm{X = BF_3} Y=NaNO2\mathrm{Y = NaNO_2}

Official answer

Option 2

NTA final key.

Chapter
Amines

Same idea in other shifts

Asked 2× in all
  1. 8 Apr 2023, Shift 1 · Q76Match List I with List II: [benzenediazonium chloride, C6H5N2Cl\mathrm{C_6H_5N_2Cl}] is reacted with reagents in List I to form products in List…MediumMatch the listHas a figure

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.