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Friday, 9 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedHardDiagram reading

JEE Main 28 July 2022, Shift 1, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

For the below given cyclic hemiacetal (X), the correct pyranose structure is :

The figure, in words

Stem figure (X): open-chain Fischer-type cyclic hemiacetal, vertical chain top to bottom: C(HO left, H right), C(HO left, H right), C(H left, OH right), C(HO left, H right), C(H left) closed by an O bridge to the top carbon, then CH2OH. Options A-D are pyranose ring drawings with HO/OH groups at differing up/down positions.
  1. (1)[figure: pyranose ring, chair/Haworth-type drawing, with HO and OH substituents (option A)]
  2. (2)[figure: pyranose ring drawing with HO and OH substituents (option B)]
  3. (3)[figure: pyranose ring drawing with HO and OH substituents (option C)]
  4. (4)[figure: pyranose ring drawing with HO and OH substituents (option D)]Official answer

Official answer

Option 4

NTA final key (2022 Session 2).

Chapter
Biomolecules
Topic
Carbohydrates
Idea tested
Haworth Projections

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.