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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 28 June 2022, Shift 1, Chemistry Q73

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

The 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 and second carbons, Br at the right end of the chain] →HBr\xrightarrow{\mathrm{HBr}} ?(P) [Ph is - C6H5\mathrm{C_6H_5}] is

The figure, in words

Stem reaction: Ph attached to a three-carbon zigzag chain with a C=C double bond between the first and second carbons (counting from Ph) and Br at the far end, reacting with HBr. Options A-D are drawn zigzag chains with Ph at the left and Br substituents as described in each option.
  1. (1)[figure: zigzag chain of three carbons with Ph on the first carbon; Br on the first carbon (drawn down), Br on the second carbon (drawn up) and Br on the third carbon at the chain end]
  2. (2)[figure: zigzag chain Ph, first carbon, second carbon, third carbon; Br on the second carbon (drawn down-right) and Br on the third carbon (drawn up at the chain end)]
  3. (3)[figure: zigzag chain of three carbons with Ph on the first carbon; Br on the first carbon (drawn down) and Br on the third carbon at the chain end; no double bond]Official answer
  4. (4)[figure: zigzag chain of three carbons with Ph on the first carbon; Br on the first carbon (drawn down); C=C double bond between the second and third carbons; Br at the end of the third carbon]

Official answer

Option 3

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. 25 Jul 2022, Shift 2 · Q73Major product of the following reaction is [figure: skeletal drawing, left to right: a C=C double bond at the left end whose inner carbon…MediumDiagram basedHas a figure
  7. 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
  8. 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

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.