JEE Main 2021 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 17 March 2021, Shift 2, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

The correct pair(s) of the ambident nucleophiles is (are) : (A)

\mathrm{AgCN/KCN}

(B)

\mathrm{RCOOAg/RCOOK}

(C)

\mathrm{AgNO_2/KNO_2}

(D)

\mathrm{AgI/KI}

(1)(A) only
(2)(B) only
(3)(A) and (C) onlyOfficial answer
(4)(B) and (C) only

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

9 Apr 2024, Shift 2 · Q75[figure: $\mathrm{C_6H_5-CH(CH_3)-CH(OCH_3)-Br}$ (benzylic carbon bearing CH $_3$ , next carbon bearing both OCH $_3$ and Br)]…HardSingle correctHas a figure
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
18 Mar 2021, Shift 2 · Q42Given below are two statements : Statement I : $\mathrm{C_2H_5OH}$ and AgCN both can generate nucleophile. Statement II : KCN and AgCN…MediumTwo statements

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.