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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 26 August 2021, Shift 1, Chemistry Q43

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

The major product formed in the following reaction is : [figure: reactant, arrow labelled HBr above, "Major Product" after the arrow; "(excess)" printed beneath the reactant]

The figure, in words

Reactant is a skeletal line drawing: a vertex with a vertical single-line branch upward, a double bond (drawn as two lines) to a lower-left vertex end, a single bond to a lower-right vertex, then a double bond to an upper-right terminal vertex. Arrow labelled HBr; "(excess)" under the reactant; "Major Product" after the arrow. Options are skeletal drawings with printed Br labels.
  1. (1)[figure: skeletal zigzag chain, Br at each end, with a vertical single-line branch on one interior vertex]
  2. (2)[figure: skeletal structure, a vertex carrying two single-line branches, joined by a double bond to the next vertex, then a single bond to a vertex bearing Br]Official answer
  3. (3)[figure: skeletal structure, a vertex carrying two single-line branches and Br, joined to a vertex bearing Br below and a single-line branch up-right]
  4. (4)[figure: skeletal structure, a vertex carrying two single-line branches and Br, joined by a single bond to a vertex that is doubly bonded to a terminal vertex]

Official answer

Option 2

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.