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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 4 September 2020, Shift 2, Chemistry Q39

Question 39 of 75 in this shift, Chemistry question 14 of 25.

Among the following compounds, which one has the shortest C−-Cl bond ?

The figure, in words

Four drawn structures (options). Option 4: HC=CH2 with HC joined to an unlabelled vertex that is joined to Cl (bond drawn as an angled line, as printed).
  1. (1)[figure: carbon bearing three CH3\mathrm{CH_3} groups (drawn as H3C\mathrm{H_3C}, H3C\mathrm{H_3C} and CH3\mathrm{CH_3}) and a Cl, all as single bonds from one central point]
  2. (2)H3C−Cl\mathrm{H_3C-Cl}
  3. (3)[figure: Cl joined by a single bond to CH; CH double-bonded to CH2\mathrm{CH_2}]Official answer
  4. (4)[figure: HC\mathrm{HC} double-bonded to CH2\mathrm{CH_2}; HC\mathrm{HC} joined by a bond to an unlabelled vertex, which is joined by a bond to Cl]

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Haloalkanes and Haloarenes
Topic
Resonance and Hyperconjugation
Idea tested
Mesomeric Effect

Same idea in other shifts

Asked 9× in all
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  3. 4 Apr 2024, Shift 1 · Q74Match List I with List II : List - I (Mechanism steps) List - II (Effect) (A) [structure: aniline, lone pair on NH2_2 donated into ring,…MediumMatch the listHas a figure
  4. 9 Apr 2024, Shift 1 · Q89How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects ? [figure: eight…MediumNumerical valueHas a figure
  5. 1 Feb 2024, Shift 2 · Q73The functional group that shows negative resonance effect is :EasySingle correct
  6. 29 Jan 2024, Shift 1 · Q72The interaction between π\pi bond and lone pair of electrons present on an adjacent atom is responsible forEasySingle correct
  7. 8 Jan 2020, Shift 1 · Q41Arrange the following compounds in increasing order of C−-OH bond length : methanol, phenol, p-ethoxyphenolMediumSingle correct
  8. 9 Jan 2020, Shift 2 · Q40Which of the following has the shortest C-Cl bond ?MediumSingle correct

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.