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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceTwo statementsMediumConceptual

JEE Main 18 March 2021, Shift 2, Chemistry Q42

Question 42 of 90 in this shift, Chemistry question 12 of 30, Section A.

Given below are two statements : Statement I : C2H5OH\mathrm{C_2H_5OH} and AgCN both can generate nucleophile. Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option :
  1. (1)Both statement I and statement II are true.
  2. (2)Both statement I and statement II are false.
  3. (3)Statement I is true but statement II is false.Official answer
  4. (4)Statement I is false but statement II is true.

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Ambident Nucleophiles (Cyanide/Nitrite)

Same idea in other shifts

Asked 4× in all
  1. 9 Apr 2024, Shift 2 · Q75[figure: C6H5−CH(CH3)−CH(OCH3)−Br\mathrm{C_6H_5-CH(CH_3)-CH(OCH_3)-Br} (benzylic carbon bearing CH3_3, next carbon bearing both OCH3_3 and Br)]…HardSingle correctHas a figure
  2. 13 Apr 2023, Shift 2 · Q75Match List I with List II 1 - Bromopropane is reacted with reagents in List I to give product in List II LIST I - Reagent | LIST II -…MediumMatch the list
  3. 17 Mar 2021, Shift 2 · Q43The correct pair(s) of the ambident nucleophiles is (are) : (A) AgCN/KCN\mathrm{AgCN/KCN} (B) RCOOAg/RCOOK\mathrm{RCOOAg/RCOOK} (C)…MediumOther

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.