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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 29 July 2022, Shift 1, Chemistry Q74

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

[figure: CH3CH2CH2-Cl, a three-carbon chain bearing Cl; left arrow with AgCN, C2H5OH−H2O\mathrm{C_2H_5OH-H_2O} gives 'A' (Major Product); right arrow with NaCN, C2H5OH−H2O\mathrm{C_2H_5OH-H_2O} gives 'B' (Major Product)] Considering the above reactions, the compound 'A' and compound 'B' respectively are :

The figure, in words

Zigzag chain of three carbons ending in Cl (skeletal), AgCN to the left, NaCN to the right; options drawn as skeletal chains with the CN/NC group (isocyanide drawn with + on N and - on C).
  1. (1)CH3CH2CH2−N+≡C−\mathrm{CH_3CH_2CH_2-N^{+}\equiv C^{-}}, CH3CH2CH2−N+≡C−\mathrm{CH_3CH_2CH_2-N^{+}\equiv C^{-}}
  2. (2)CH3CH2CH2−C≡N\mathrm{CH_3CH_2CH_2-C\equiv N}, CH3CH2CH2−C≡N\mathrm{CH_3CH_2CH_2-C\equiv N}
  3. (3)CH3CH2CH2−N+≡C−\mathrm{CH_3CH_2CH_2-N^{+}\equiv C^{-}}, CH3CH2CH2−C≡N\mathrm{CH_3CH_2CH_2-C\equiv N}Official answer
  4. (4)CH3CH2CH2−C≡N\mathrm{CH_3CH_2CH_2-C\equiv N}, CH3CH2CH2−N+≡C−\mathrm{CH_3CH_2CH_2-N^{+}\equiv C^{-}}

Official answer

Option 3

NTA final key.

Same idea in other shifts

Asked 2× in all
  1. 1 Feb 2024, Shift 1 · Q74Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Haloalkanes…MediumAssertion–reason

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.