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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 10 April 2023, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

The major product ‘P’ formed in the given reaction is [structure: naphthalene ring bearing CH2CH3\mathrm{CH_2CH_3} at one position of one ring, CH=CH2\mathrm{CH{=}CH_2} at the para (opposite) position of the same ring, and CH2COOCH3\mathrm{CH_2COOCH_3} on the other ring] →(ii) H3O+(i) alk.KMnO4, Δ\xrightarrow[\text{(ii) } \mathrm{H_3O^+}]{\text{(i) alk.}\mathrm{KMnO_4},\ \Delta} P (Major Product)

The figure, in words

Substituted naphthalene: CH2CH3 and CH=CH2 at para positions of one ring, CH2COOCH3 on the other ring; reagents (i) alk. KMnO4, heat, (ii) H3O+.
  1. (1)[figure: naphthalene bearing CH2COOH\mathrm{CH_2COOH} at one position, CH2COOH\mathrm{CH_2COOH} on the other ring, and a diol side chain drawn as a Fischer projection (HO–H, HO–H, H) at the position para to the first]
  2. (2)[figure: naphthalene bearing COOH\mathrm{COOH} at the two para positions of one ring and CH2COOH\mathrm{CH_2COOH} on the other ring]
  3. (3)[figure: naphthalene bearing CH2COOH\mathrm{CH_2COOH} at one position, COCH3\mathrm{COCH_3} at the para position of the same ring, and CH2COOH\mathrm{CH_2COOH} on the other ring]
  4. (4)[figure: naphthalene bearing COOH\mathrm{COOH} at the two para positions of one ring and COOH\mathrm{COOH} (directly attached) on the other ring]Official answer

Official answer

Option 4

NTA final key.