Learn

Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceOtherMediumMulti-step

JEE Main 25 July 2022, Shift 2, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

CH3−CH2−CN\mathrm{CH_3-CH_2-CN} --(CH3MgBr\mathrm{CH_3MgBr}, Ether)--> A --(H3O+\mathrm{H_3O^+})--> B --(Zn-Hg, HCl)--> C The correct structure of C is
  1. (1)CH3−CH2−CH2−CH3\mathrm{CH_3-CH_2-CH_2-CH_3}Official answer
  2. (2)CH3−CH2−C(=O)−CH3\mathrm{CH_3-CH_2-C(=O)-CH_3}
  3. (3)CH3−CH2−CH(OH)−CH3\mathrm{CH_3-CH_2-CH(OH)-CH_3}
  4. (4)CH3−CH2−CH=CH2\mathrm{CH_3-CH_2-CH=CH_2}

Official answer

Option 1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Alkanes and Free Radicals
Idea tested
Clemmensen Reduction to Alkanes

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2024, Shift 1 · Q79Identify the product in the following reaction : [reactant: benzene ring with a CHO group and, meta to it, a COCH3 group…EasyOtherHas a figure
  2. 11 Apr 2023, Shift 2 · Q76The major product formed in the following reaction is C6H5−CH(OH)−CH(CH3)−CH2CHO\mathrm{C_6H_5-CH(OH)-CH(CH_3)-CH_2CHO}…MediumOtherHas 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.