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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedHardApplication

JEE Main 25 June 2022, Shift 2, Chemistry Q75

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

Amongst the following, the major product of the given chemical reaction is [drawn: six-membered ring containing one O, with a double bond drawn on the ring edge on the side next to the O] →CH3OHBr2\xrightarrow[\mathrm{CH_3OH}]{\mathrm{Br_2}} Major Product

The figure, in words

Reactant drawn as a six-membered ring with one O at the bottom and a double bond on the ring edge on the right side (between the carbon next to O and its neighbour). Reagents over the arrow: Br2 above, CH3OH below. Options are four six-membered O-containing rings with Br and OCH3 on adjacent ring carbons, differing in wedge/hash bonds.
  1. (1)[figure: six-membered ring with one O; two ring carbons on the right side carry substituents; upper carbon: Br on a hashed bond, lower carbon (next to ring O): OCH3\mathrm{OCH_3} on a bold wedge]Official answer
  2. (2)[figure: same ring; upper carbon: Br on a bold wedge, lower carbon (next to ring O): OCH3\mathrm{OCH_3} on a bold wedge]
  3. (3)[figure: same ring; upper carbon: OCH3\mathrm{OCH_3} on a hashed bond, lower carbon (next to ring O): Br on a bold wedge]
  4. (4)[figure: same ring; upper carbon: OCH3\mathrm{OCH_3} on a bold wedge, lower carbon (next to ring O): Br on a hashed bond]

Official answer

Option 1

NTA final key.

Chapter
Hydrocarbons
Topic
Alkenes and Alkynes
Idea tested
Halohydrin Formation Regiochemistry

Same idea in other shifts

Asked 3× in all
  1. 27 Jul 2022, Shift 2 · Q73Major product ‘B’ of the following reaction sequence is : CH3−C(CH3)=CH−CH3\mathrm{CH_3-C(CH_3)=CH-CH_3} →CH3OHBr2\xrightarrow[\mathrm{CH_3OH}]{\mathrm{Br_2}} A…HardDiagram basedHas a figure
  2. 31 Aug 2021, Shift 1 · Q44Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Treatment of…MediumAssertion–reason

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.