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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 6 September 2020, Shift 2, Chemistry Q26

Question 26 of 75 in this shift, Chemistry question 1 of 25.

Which one of the following statements is not true ?
  1. (1)Lactose (C11H22O11\mathrm{C_{11}H_{22}O_{11}}) is a disaccharide and it contains 8 hydroxyl groups.
  2. (2)On acid hydrolysis, lactose gives one molecule of D(+)-glucose and one molecule of D(+)-galactose.
  3. (3)Lactose is a reducing sugar and it gives Fehling's test.
  4. (4)Lactose contains α\alpha-glycosidic linkage between C1\mathrm{C_1} of galactose and C4\mathrm{C_4} of glucose.Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Biomolecules
Topic
Carbohydrates
Idea tested
Lactose Structure and Linkage

Same topic in other shifts

All Carbohydrates questions
  1. 4 Apr 2026, Shift 1 · Q68Given below are two statements: Statement I: The structure of Maltose is given below: [structure of maltose: two glucopyranose rings…EasyTwo statementsHas a figure
  2. 4 Apr 2026, Shift 2 · Q68A D-aldotetrose on oxidation with concentrated HNO3\mathrm{HNO_3} resulted in optically inactive dicarboxylic acid. The structure of the…MediumDiagram basedHas a figure
  3. 5 Apr 2026, Shift 1 · Q69Identify the correct statements. A. Glucose exists in two anomeric forms. B. Anomers of glucose differ in configuration at C-1 in cyclic…MediumOther
  4. 5 Apr 2026, Shift 2 · Q69Given below are two statements : Statement I : [figure: two ring (pyranose) structures, each with CH2_2-OH, ring O, H, OH and H…MediumTwo statementsHas a figure
  5. 6 Apr 2026, Shift 2 · Q69Consider the following reactions. Total number of electrons in the π\pi bonds and lone pair of electrons in the product (X) is : [figure:…HardSingle correctHas a figure
  6. 8 Apr 2026, Shift 2 · Q69The incorrect statement from the following with respect to carbohydrates is :EasySingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.