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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 18 March 2021, Shift 1, Chemistry Q44

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

Reaction of Grignard reagent, C2H5MgBr\mathrm{C_2H_5MgBr} with C8H8O\mathrm{C_8H_8O} followed by hydrolysis gives compound "A" which reacts instantly with Lucas reagent to give compound B, C10H13Cl\mathrm{C_{10}H_{13}Cl}. The Compound B is :

The figure, in words

Each option is a skeletal structure of a chlorinated alkylbenzene, C10H13Cl.
  1. (1)[figure: C6H5CH(CH3)CH2CH2Cl\mathrm{C_6H_5CH(CH_3)CH_2CH_2Cl} (phenyl on a carbon bearing CH3 and a CH2CH2Cl chain)]
  2. (2)[figure: C6H5CH(CH2CH3)CH2Cl\mathrm{C_6H_5CH(CH_2CH_3)CH_2Cl}]
  3. (3)[figure: C6H5CH(CH3)CH(Cl)CH3\mathrm{C_6H_5CH(CH_3)CH(Cl)CH_3}]
  4. (4)[figure: C6H5C(CH3)(Cl)CH2CH3\mathrm{C_6H_5C(CH_3)(Cl)CH_2CH_3}]Official answer

Official answer

Option 4

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Grignard Synthesis of Alcohols

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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 42 of the 174 JEE Main shifts held from 2017 to 2026.