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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 26 February 2021, Shift 1, Chemistry Q43

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

For the given reaction : [reaction scheme, see figure_note: structure →UV lightBr2\xrightarrow[\text{UV light}]{\mathrm{Br_2}} ‘A’ (major product) monobrominated] What is ‘A’?

The figure, in words

Stem scheme as drawn: ring with inner circle bearing CH2CH3 on the upper-right vertex and CN on the bottom vertex; arrow labelled Br2 / UV light; product 'A' (major product) monobrominated. Options are ring structures as described in each option.
  1. (1)[figure: ring with inner circle; CH2CH3\mathrm{CH_2CH_3} on top vertex, Br on upper-right vertex, CN on lower-right vertex]
  2. (2)[figure: ring with inner circle; CH2CH3\mathrm{CH_2CH_3} on top vertex, CN on lower-right vertex, Br on bottom vertex]
  3. (3)[figure: ring with inner circle; top vertex bears a CH group that is bonded to Br and to CH3\mathrm{CH_3}; CN on lower-right vertex]Official answer
  4. (4)[figure: ring with inner circle; CH2CH3\mathrm{CH_2CH_3} on top vertex, Br on lower-left vertex, CN on lower-right vertex]

Official answer

Option 3

NTA final key.

Chapter
Hydrocarbons
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.