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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonEasyRecall

JEE Main 26 August 2021, Shift 2, Chemistry Q49

Question 49 of 90 in this shift, Chemistry question 19 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) : Sucrose is a disaccharide and a non-reducing sugar. Reason (R) : Sucrose involves glycosidic linkage between C1\mathrm{C_1} of β-glucose and C2\mathrm{C_2} of α-fructose. Choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are true and (R) is the true explanation of (A).
  2. (2)Both (A) and (R) are true but (R) is not the true explanation of (A).
  3. (3)(A) is true but (R) is false.Official answer
  4. (4)(A) is false but (R) is true.

Official answer

Option 3

NTA final key.

Chapter
Biomolecules
Topic
Carbohydrates
Idea tested
Sucrose Structure and Linkage

Same idea in other shifts

Asked 4× in all
  1. 25 Jul 2022, Shift 2 · Q78Glycosidic linkage between C1 of α\alpha-glucose and C2 of β\beta–fructose is found inEasySingle correct
  2. 28 Jun 2022, Shift 2 · Q79When sugar ‘X’ is boiled with dilute H2SO4\mathrm{H_2SO_4} in alcoholic solution, two isomers ‘A’ and ‘B’ are formed. ‘A’ on oxidation with…EasySingle correct
  3. 26 Feb 2021, Shift 2 · Q48Match List-I with List-II. List-I | List-II (a) Sucrose | (i) β\beta-D-Galactose and β\beta-D-Glucose (b) Lactose | (ii)…EasyMatch the list

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.