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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 31 August 2021, Shift 1, Chemistry Q44

Question 44 of 90 in this shift, Chemistry question 14 of 30, Section A.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Treatment of bromine water with propene yields 1-bromopropan-2-ol. Reason (R) : Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are true and (R) is the correct explanation of (A).Official answer
  2. (2)Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. (3)(A) is true but (R) is false.
  4. (4)(A) is false but (R) is true.

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. 25 Jun 2022, Shift 2 · Q75Amongst the following, the major product of the given chemical reaction is [drawn: six-membered ring containing one O, with a double bond…HardDiagram 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.