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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 30 January 2024, Shift 2, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

m-chlorobenzaldehyde on treatment with 50% KOH solution yields

The figure, in words

All four options are structures of products.
  1. (1)[figure: 3,3'-dichlorobenzoin, Cl-C6H4-CH(OH)-C(=O)-C6H4-Cl with Cl meta on both rings]
  2. (2)[figure: two molecules of m-hydroxybenzaldehyde, HO-C6H4-CHO (OH meta) + HO-C6H4-CHO]
  3. (3)[figure: m-chlorobenzoate anion, Cl-C6H4-COO^- (meta) + m-chlorobenzyl alcohol, Cl-C6H4-CH2OH (meta)]Official answer
  4. (4)[figure: m-hydroxybenzoate anion, HO-C6H4-COO^- (meta) + m-hydroxybenzyl alcohol, HO-C6H4-CH2OH (meta)]

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aldol and Cannizzaro
Idea tested
Cannizzaro Reaction

Same topic in other shifts

All Aldol and Cannizzaro questions
  1. 2 Apr 2026, Shift 2 · Q66An organic compound 'x' where molar ratio of C, O and H are equal, on treatment with 50% KOH under reflux followed by acidification…MediumSingle correct
  2. 6 Apr 2026, Shift 2 · Q64'xx' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at…MediumSingle correct
  3. 2 Apr 2025, Shift 1 · Q68Given below are two statements : Statement (I) : Vanillin ([structure: benzene ring with -CHO, -OH para to CHO and -OCH3 ortho to OH])…MediumTwo statementsHas a figure
  4. 3 Apr 2025, Shift 2 · Q68The major product (P) in the following reaction is : Ph−CO−CHO\mathrm{Ph{-}CO{-}CHO} →ΔKOH\xrightarrow[\Delta]{\mathrm{KOH}} P (Major Product)MediumDiagram basedHas a figure
  5. 8 Apr 2025, Shift 2 · Q68When [structure: CH3C(=O)CH2CH2CH2CH2CHO\mathrm{CH_3C(=O)CH_2CH_2CH_2CH_2CHO}, a skeletal zigzag chain with a methyl ketone at one end and an aldehyde (C=O…MediumSingle correctHas a figure
  6. 25 Jul 2021, Shift 1 · Q44[figure: 3,3-dimethylcyclopentanone (ketone C=O, gem-dimethyl on adjacent ring carbon) reacts with CH3CHO\mathrm{CH_3CHO}, NaOH to give 'P'…HardSingle correctHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.