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Friday, 9 October

JEE Main 2017 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 2 April 2017 (offline), Chemistry Q55

Question 55 of 90 in this shift, Chemistry question 25 of 30.

The increasing order of the reactivity of the following halides for the SN1\mathrm{S_N1} reaction is : CH3CHCH2CH3\mathrm{CH_3CHCH_2CH_3} with Cl on the middle carbon (I) CH3CH2CH2Cl\mathrm{CH_3CH_2CH_2Cl} (II) p−H3CO−C6H4−CH2Clp-\mathrm{H_3CO-C_6H_4-CH_2Cl} (III)

The figure, in words

Structure (I) is 2-chlorobutane drawn with Cl below the CH carbon: CH3-CH(Cl)-CH2CH3.
  1. (1)(I) < (III) < (II)
  2. (2)(II) < (III) < (I)
  3. (3)(III) < (II) < (I)
  4. (4)(II) < (I) < (III)Official answer

Official answer

Option 4

CBSE answer key (25/04/2017, used for result).

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Allylic and Benzylic Reactivity in SN1

Same idea in other shifts

Asked 4× in all
  1. 2 Apr 2026, Shift 1 · Q64Given below are two statements : Statement (I) : Benzyl chloride reacts faster in SN1\mathrm{S_N1} mechanism than ethyl chloride. Statement…EasyTwo statements
  2. 11 Apr 2023, Shift 1 · Q74[figure: Reaction (I): 4-methoxybenzyl chloride (MeO−C6H4−CH2Cl\mathrm{MeO{-}C_6H_4{-}CH_2Cl}) + Nu gives 4-methoxybenzyl-Nu. Reaction (II):…MediumDiagram basedHas a figure
  3. 3 Aug 2021, Shift 2 · Q45Arrange the following halides in the increasing order of their reactivity towards SN1\mathrm{S_N1} reaction mechanism.MediumSingle correctHas a figure

Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); 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.