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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 22 July 2021, Shift 2, Chemistry Q47

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

In the chemical reactions given above A and B respectively are :

The figure, in words

Reaction scheme drawn above the question text: benzene ring bearing N2+ Cl- (written N2 with superscript +, Cl with superscript -) + A + H2O -> benzene ring (labelled 'Major Product'); then, with arrow labelled 'B, Anhyd. AlCl3', -> benzene ring bearing CH2CH3.
  1. (1)H3PO2\mathrm{H_3PO_2} and CH3CH2OH\mathrm{CH_3CH_2OH}
  2. (2)CH3CH2OH\mathrm{CH_3CH_2OH} and H3PO2\mathrm{H_3PO_2}
  3. (3)H3PO2\mathrm{H_3PO_2} and CH3CH2Cl\mathrm{CH_3CH_2Cl}Official answer
  4. (4)CH3CH2Cl\mathrm{CH_3CH_2Cl} and H3PO2\mathrm{H_3PO_2}

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Deamination Byproducts: Hypophosphorous Acid

Same idea in other shifts

Asked 2× in all
  1. 28 Jun 2022, Shift 1 · Q76Identify the major product formed in the following sequence of reactions : [benzene ring with NH2 substituent]…MediumDiagram basedHas 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.