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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceOtherMediumApplication

JEE Main 26 July 2022, Shift 1, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr) followed by acidic hydrolysis ? [figure: central carbon bonded to Ph (above), Ph (left), OH (right) and CH3\mathrm{CH_3} (below)]

The figure, in words

Stem shows the alcohol: central C with Ph above, Ph at left, OH at right, CH3 below. Option C: CH3-C(=O)-O-Ph (O double-bonded above C). Option D: Ph-C(=O)-CH3 (O double-bonded below C).
  1. (1)CH3−C≡N\mathrm{CH_3-C\equiv N}
  2. (2)Ph−C≡N\mathrm{Ph-C\equiv N}
  3. (3)CH3−C∥O−O−Ph\mathrm{CH_3-\overset{O}{\overset{\|}{C}}-O-Ph}
  4. (4)Ph−C∥O−CH3\mathrm{Ph-\underset{O}{\underset{\|}{C}}-CH_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

Same idea in other shifts

Asked 3× in all
  1. 11 Apr 2023, Shift 1 · Q90[figure: 4-hydroxybutanal, OHC−CH2CH2CH2−OH\mathrm{OHC{-}CH_2CH_2CH_2{-}OH} (y mole)] →H3O+x mol of MeMgBr\xrightarrow[\mathrm{H_3O^+}]{x\ \text{mol of MeMgBr}} [figure:…MediumNumerical valueHas a figure
  2. 9 Jan 2020, Shift 2 · Q50Consider the following reactions A →(ii) H3O+(i) CH3MgBr\xrightarrow[\text{(ii) } H_3O^+]{\text{(i) } CH_3MgBr} B →573 KCu\xrightarrow[573\text{ K}]{Cu}…MediumNumerical value

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.