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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedHardApplication

JEE Main 3 September 2020, Shift 2, Chemistry Q40

Question 40 of 75 in this shift, Chemistry question 15 of 25.

Consider the following reaction : [figure] →anhydrideChromic\xrightarrow[\text{anhydride}]{\text{Chromic}} ‘P’ The product ‘P’ gives positive ceric ammonium nitrate test. This is because of the presence of which of these −-OH group(s) ?

The figure, in words

Drawn polycyclic skeleton of three fused six-membered rings. Left ring is a benzene-type ring (alternating double bonds drawn) bearing O with a circled H labelled d at its left (written 'd (H) O'). The middle ring has an O with a circled H labelled c on its top carbon. The right ring has a carbon bearing CH3 and an O with a circled H labelled b, and another ring carbon carries a side chain with a C=C double bond followed by CH2 and an O with a circled H labelled a. The arrow below is labelled 'Chromic anhydride' and leads to 'P'.
  1. (1)(c) and (d)
  2. (2)(b) and (d)
  3. (3)(b) onlyOfficial answer
  4. (4)(d) only

Official answer

Option 3

NTA final key (Sep 2020).

Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.