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Friday, 9 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 13 April 2023, Shift 2, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

The major product for the following reaction is: CH2=CH−CN\mathrm{CH_2{=}CH{-}CN} + HO−CH2CH2−SH\mathrm{HO{-}CH_2CH_2{-}SH} (arrow)

The figure, in words

Reaction scheme: acrylonitrile (CH2=CH-CN, drawn as skeletal structure) treated with HO-CH2CH2-SH (2-mercaptoethanol); options are skeletal structures.
  1. (1)HS−CH2CH2−O−CH2CH2−CN\mathrm{HS{-}CH_2CH_2{-}O{-}CH_2CH_2{-}CN}
  2. (2)HO−CH2CH2−S−CH2CH2−CN\mathrm{HO{-}CH_2CH_2{-}S{-}CH_2CH_2{-}CN}Official answer
  3. (3)CH2=CH−C(=NH)−O−CH2CH2−SH\mathrm{CH_2{=}CH{-}C(=NH){-}O{-}CH_2CH_2{-}SH}
  4. (4)CH2=CH−C(=NH)−S−CH2CH2−OH\mathrm{CH_2{=}CH{-}C(=NH){-}S{-}CH_2CH_2{-}OH}

Official answer

Option 2

NTA final key.

Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.