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Saturday, 31 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 7× 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. 24 Jun 2022, Shift 2 · Q89Consider the above reaction. The number of π\pi electrons present in the product 'P' is ________.MediumNumerical valueHas a figure
  4. 29 Jun 2022, Shift 2 · Q75Two isomers (A) and (B) with Molar mass 184 g/mol and elemental composition C, 52.2% ; H, 4.9 % and Br 42.9%, respectively on oxidation…HardDiagram basedHas a figure
  5. 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
  6. 31 Aug 2021, Shift 1 · Q45The correct order of reactivity of the given chlorides with acetate in acetic acid is :HardDiagram basedHas 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 108 of the 174 JEE Main shifts held from 2017 to 2026.