JEE Main 2023 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 10 April 2023, Shift 2, Chemistry Q75

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

Incorrect method of preparation for alcohols from the following is:

(1)Hydroboration-oxidation of alkene.
(2)Reaction of Ketone with RMgBr followed by hydrolysis.
(3)Ozonolysis of alkene.Official answer
(4)Reaction of alkyl halide with aqueous NaOH.

Official answer

Option 3

NTA final key.

Chapter: Alcohols, Phenols and Ethers
Topic: Alkenes and Alkynes
Idea tested: Hydroboration-Oxidation

Same idea in other shifts

Asked 6× in all

4 Apr 2024, Shift 2 · Q79 $\mathrm{CH_3-CH_2-CH_2-Br + NaOH \xrightarrow{C_2H_5OH}}$ Product 'A' Product A $\xrightarrow{\mathrm{H_2O/H^+}}$ Product "B" Product A…EasySingle correct
9 Apr 2024, Shift 1 · Q76Identify the product A and product B in the following set of reactions. [figure: $\mathrm{CH_3-CH=CH_2}$ …EasySingle correctHas a figure
15 Apr 2023, Shift 1 · Q76The product formed in the following multistep reaction is : $\mathrm{CH_3-CH=CH_2}$ …MediumOtherHas a figure
24 Jun 2022, Shift 2 · Q75Which of the following reagents / reactions will convert 'A' to 'B'?MediumSingle correctHas a figure
8 Jan 2020, Shift 2 · Q45The major product [B] in the following sequence of reactions is :…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.