Learn

Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctHardMulti-step

JEE Main 6 April 2026, Shift 2, Chemistry Q69

Question 69 of 75 in this shift, Chemistry question 19 of 25, Section A.

Consider the following reactions. Total number of electrons in the π\pi bonds and lone pair of electrons in the product (X) is : [figure: open-chain glucose] CHO−(CHOH)4−CH2OH\mathrm{CHO{-}(CHOH)_4{-}CH_2OH} →(i) HI, Δ; (ii) V2O5/10-20 atm/773 K; (iii) Benzoyl chloride/Anhyd. AlCl3\xrightarrow{\text{(i) HI, }\Delta;\ \text{(ii) V}_2\mathrm{O}_5/10\text{-}20\text{ atm}/773\text{ K};\ \text{(iii) Benzoyl chloride/Anhyd. AlCl}_3} (X) Major product

The figure, in words

Open-chain glucose CHO-(CHOH)4-CH2OH drawn vertically, with reagents (i) HI, Δ; (ii) V2O5/10-20 atm/773 K; (iii) benzoyl chloride/anhyd. AlCl3 giving (X).
  1. (1)12
  2. (2)16
  3. (3)14
  4. (4)18Official answer

Official answer

Option 4

NTA final key.

Chapter
Biomolecules
Topic
Carbohydrates
Idea tested
Reduction with HI and Red Phosphorus

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. 8 Apr 2026, Shift 2 · Q69The incorrect statement from the following with respect to carbohydrates is :EasySingle correct
  6. 3 Apr 2025, Shift 1 · Q70Which of the following is the correct structure of L−-Fructose?MediumDiagram basedHas a figure

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.