JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 9 January 2020, Shift 2, Chemistry Q40

Question 40 of 75 in this shift, Chemistry question 15 of 25, Section A.

Which of the following has the shortest C-Cl bond ?

(1) $\mathrm{Cl-CH=CH_2}$
(2) $\mathrm{Cl-CH=CH-NO_2}$ Official answer
(3) $\mathrm{Cl-CH=CH-CH_3}$
(4) $\mathrm{Cl-CH=CH-OCH_3}$

Official answer

Option 2

NTA final key (Jan 2020).

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

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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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.