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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 27 August 2021, Shift 1, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

In the following sequence of reactions the P is : [ring structure with Cl drawn] + Mg →etherdry\xrightarrow[\text{ether}]{\text{dry}} [ A ] →ethanol\xrightarrow{\text{ethanol}} P (Major Product)

The figure, in words

Starting material drawn as a five-membered all-carbon ring with a Cl substituent on one vertex; reagents Mg, dry ether, giving [A], then ethanol, giving P (Major Product).
  1. (1)[figure: five-membered ring with an O−CH2CH3\mathrm{O-CH_2CH_3} substituent]
  2. (2)[figure: five-membered ring with no substituent]Official answer
  3. (3)[figure: five-membered ring with a CH2CH3\mathrm{CH_2CH_3} substituent]
  4. (4)[figure: five-membered ring with one C=C double bond]

Official answer

Option 2

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alkanes and Free Radicals
Idea tested
Alkane Synthesis via Grignard Protonation

Same idea in other shifts

Asked 3× in all
  1. 26 Jul 2022, Shift 2 · Q89A 100 mL solution of CH3CH2MgBr\mathrm{CH_3CH_2MgBr} on treatment with methanol produces 2.24 mL of a gas at STP. The weight of gas produced is…EasyNumerical value
  2. 31 Aug 2021, Shift 2 · Q43For the following sequence of reactions, the correct products are : [benzene ring drawn with alternating double bonds] 1. Br2/Fe/Δ\Delta…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.