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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 25 July 2022, Shift 2, Chemistry Q73

Question 73 of 90 in this shift, Chemistry question 13 of 30, Section A.

Major product of the following reaction is [figure: skeletal drawing, left to right: a C=C double bond at the left end whose inner carbon is bonded directly to the carbonyl carbon (C=O, O drawn below); the carbonyl carbon is also bonded to a chain oxygen; that O is joined to a chain ending in a C=C double bond at the right end] --2 HBr-->

The figure, in words

Reactant drawn as skeletal formula: C=C at left end bonded directly to the carbonyl carbon C(=O) (O below), which is bonded to O, which is attached to a chain ending in C=C at right. Reagent 2 HBr over the arrow. Options are skeletal structures with Br atoms placed as described.
  1. (1)[figure: skeletal structure; on the left a carbon bearing Br is bonded to the carbonyl carbon (C=O, O below) and to a one-bond branch; the carbonyl carbon is bonded to O, which is joined to a zigzag chain whose terminal carbon carries Br]
  2. (2)[figure: skeletal structure; on the left a carbon bearing Br is bonded to the carbonyl carbon (C=O, O below) and to a one-bond branch; the carbonyl carbon is bonded to O, which is joined to a carbon bearing Br and a one-bond branch]
  3. (3)[figure: skeletal structure; a zigzag chain on the left, terminal carbon carrying Br, joined to the carbonyl carbon (C=O, O below); the carbonyl carbon is bonded to O, which is joined to a zigzag chain whose terminal carbon carries Br]
  4. (4)[figure: skeletal structure; a zigzag chain on the left, terminal carbon carrying Br, joined to the carbonyl carbon (C=O, O below); the carbonyl carbon is bonded to O, which is joined to a carbon bearing Br and a one-bond branch]Official answer

Official answer

Option 4

NTA final key.

Chapter
Hydrocarbons
Topic
Alkenes and Alkynes
Idea tested
Markovnikov's Rule Application

Same idea in other shifts

Asked 13× in all
  1. 6 Apr 2026, Shift 1 · Q66Given below are two statements: Statement I: 3-phenylpropene reacts with HBr and gives secondary alkyl bromide having a chiral carbon atom…MediumTwo statements
  2. 4 Apr 2025, Shift 2 · Q65Consider the following molecule (X). The structure of X is [figure: tricyclic fused polycyclic hydrocarbon (X) containing a cyclopentene…HardDiagram basedHas a figure
  3. 4 Apr 2024, Shift 1 · Q77Identify the correct set of reagents or reaction conditions 'X' and 'Y' in the following set of transformation.…EasyOther
  4. 31 Jan 2024, Shift 1 · Q76The product (C) in the below mentioned reaction is :…EasySingle correct
  5. 31 Jan 2024, Shift 2 · Q75Major product of the following reaction is -HardDiagram basedHas a figure
  6. 24 Jun 2022, Shift 1 · Q90The major product 'A' of the following given reaction has ______ sp2sp^2 hybridized carbon atoms. 2,7-Dimethyl-2,6-octadiene…HardNumerical value
  7. 25 Jun 2022, Shift 1 · Q73The product formed in the following reaction. [figure: (CH3)2C=CH2\mathrm{(CH_3)_2C{=}CH_2} drawn with two CH3\mathrm{CH_3} on the left carbon and…MediumDiagram basedHas a figure
  8. 28 Jun 2022, Shift 1 · Q73The major product (P) in the reaction [reaction drawn: Ph at left, zigzag chain of three carbons with a C=C double bond between the first…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.