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Friday, 9 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 11 April 2023, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

[figure: Reaction (I): 4-methoxybenzyl chloride (MeO−C6H4−CH2Cl\mathrm{MeO{-}C_6H_4{-}CH_2Cl}) + Nu gives 4-methoxybenzyl-Nu. Reaction (II): 4-nitrobenzyl chloride (O2N−C6H4−CH2Cl\mathrm{O_2N{-}C_6H_4{-}CH_2Cl}) + Nu gives 4-nitrobenzyl-Nu.] Where Nu = Nucleophile Find out the correct statement from the options given below for the above 2 reactions.

The figure, in words

Two reactions: (I) para-methoxybenzyl chloride + Nu -> para-methoxybenzyl-Nu; (II) para-nitrobenzyl chloride + Nu -> para-nitrobenzyl-Nu.
  1. (1)Reaction (I) is of 1st^{st} order and reaction (II) is of 2nd^{nd} orderOfficial answer
  2. (2)Reactions (I) and (II) both are of 1st^{st} order
  3. (3)Reactions (I) and (II) both are of 2nd^{nd} order
  4. (4)Reaction (I) is of 2nd^{nd} order and reaction (II) is of 1st^{st} order

Official answer

Option 1

NTA final key.

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. 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
  3. 2 Apr 2017 (offline) · Q55The 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…MediumOtherHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.