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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceOtherMediumMulti-step

JEE Main 4 September 2020, Shift 2, Chemistry Q41

Question 41 of 75 in this shift, Chemistry question 16 of 25.

The major product [B] in the following reactions is : CH3−CH2−CH∣CH3−CH2−OCH2−CH3→HeatHI[A] alcohol→ΔH2SO4[B]\mathrm{CH_3-CH_2-\underset{\underset{CH_3}{|}}{CH}-CH_2-OCH_2-CH_3 \xrightarrow[Heat]{HI} [A]\ alcohol \xrightarrow[\Delta]{H_2SO_4} [B]}

The figure, in words

Reaction scheme printed as condensed formulas: CH3-CH2-CH(CH3)-CH2-OCH2-CH3 (CH3 branch drawn above CH) with reagent HI, Heat giving [A] alcohol, then H2SO4, Delta giving [B]. CH3 branch drawn above the carbon in options 1 and 4.
  1. (1)CH3−CH=C∣CH3−CH3\mathrm{CH_3-CH=\underset{\underset{CH_3}{|}}{C}-CH_3}Official answer
  2. (2)CH2=CH2\mathrm{CH_2=CH_2}
  3. (3)CH3−CH2−CH=CH−CH3\mathrm{CH_3-CH_2-CH=CH-CH_3}
  4. (4)CH3−CH2−C∣CH3=CH2\mathrm{CH_3-CH_2-\underset{\underset{CH_3}{|}}{C}=CH_2}

Official answer

Option 1

NTA final key (Sep 2020).

Chapter
Alcohols, Phenols and Ethers
Topic
Ethers
Idea tested
Cold HI Cleavage (SN2)

Same topic in other shifts

All Ethers questions
  1. 6 Apr 2026, Shift 2 · Q66Consider the following reaction. [figure: benzyl phenyl ether, C6H5−O−CH2−C6H5\mathrm{C_6H_5{-}O{-}CH_2{-}C_6H_5}] ++ HI →\rightarrow Product…EasyTwo statementsHas a figure
  2. 4 Apr 2025, Shift 2 · Q68A toxic compound "A" when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative "B". "B" is…HardSingle correct
  3. 8 Apr 2025, Shift 2 · Q67Which one of the following reactions will not lead to the desired ether formation in major proportion ? (iso-Bu ⇒ isobutyl, sec-Bu ⇒…MediumSingle correctHas a figure
  4. 29 Jan 2024, Shift 1 · Q77The major product (P) in the following reaction isMediumDiagram basedHas a figure
  5. 10 Apr 2023, Shift 1 · Q75Suitable reaction condition for preparation of Methyl phenyl ether isEasySingle correct
  6. 28 Jul 2022, Shift 2 · Q44Compound I is heated with Conc. HI to give a hydroxy compound A which is further heated with Zn dust to give compound B. Identify A and B.…EasyDiagram 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. 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.