Learn

Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 1 February 2024, Shift 1, Chemistry Q74

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

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Haloalkanes react with KCN to form alkyl cyanides as a main product while with AgCN form isocyanide as the main product. Reason (R) : KCN and AgCN both are highly ionic compounds. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are correct and (R) is the correct explanation of (A)
  2. (2)Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. (3)(A) is correct but (R) is not correctOfficial answer
  4. (4)(A) is not correct but (R) is correct

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Ambident Nucleophiles (Cyanide vs Isocyanide)

Same idea in other shifts

Asked 2× in all
  1. 29 Jul 2022, Shift 1 · Q74[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…MediumDiagram basedHas 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.