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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 29 July 2022, Shift 1, Chemistry Q75

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

[figure: 4-hydroxybenzaldehyde (OH at top, CHO at bottom of benzene ring) →Br2\xrightarrow{\mathrm{Br_2}} A →NH2OH\xrightarrow{\mathrm{NH_2OH}} B →ΔP2O5\xrightarrow[\Delta]{\mathrm{P_2O_5}} C] Consider the above reaction sequence, the Product 'C' is :

The figure, in words

Reaction sequence from 4-hydroxybenzaldehyde with Br2, NH2OH, then P2O5/heat.
  1. (1)[figure: benzene ring with Br at two meta positions and CN at the third (3,5-dibromobenzonitrile)]
  2. (2)[figure: benzene ring with OH at top, Br at both ortho positions to OH and CHO para to OH (3,5-dibromo-4-hydroxybenzaldehyde)]
  3. (3)[figure: benzene ring with Br at two meta positions and CHO at the third (3,5-dibromobenzaldehyde)]
  4. (4)[figure: benzene ring with OH at top, Br at both ortho positions to OH and CN para to OH (3,5-dibromo-4-hydroxybenzonitrile)]Official answer

Official answer

Option 4

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Geometrical Isomerism in Oximes

Same topic in other shifts

All Nucleophilic Addition questions
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  3. 7 Apr 2025, Shift 2 · Q68"P" is an optically active compound with molecular formula C6H12O\mathrm{C_6H_{12}O}. When 'P' is treated with 2, 4-dinitrophenylhydrazine, it…MediumDiagram basedHas a figure
  4. 6 Apr 2024, Shift 1 · Q79Which among the following aldehydes is most reactive towards nucleophilic addition reactions?EasySingle correctHas a figure
  5. 6 Apr 2024, Shift 2 · Q78Consider the given reaction, identify the major product P. CH3−COOH\mathrm{CH_3-COOH}…MediumSingle correct
  6. 30 Jan 2024, Shift 1 · Q90The compound formed by the reaction of ethanal with semicarbazide contains ________ number of nitrogen atoms.EasyNumerical value

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.