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Which of the following… (Class 12 Chemistry 2025, Q11)

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ChemistryCBSE Class 12 · Board exam 2025, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2025: question 11

Set in the CBSE Class 12 board exam of 2025, paper 56/1/1, section A, question 11, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q11 · 1 mark · MCQBiomolecules

Which of the following statements is not true about glucose ?

  1. (A)It is an aldohexose.
  2. (B)On heating with HI it forms n-hexane.
  3. (C)It exists in furanose form.
  4. (D)It does not give Schiff's test.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 56/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Check each statement against the known properties of glucose.

Hint 2

Recall the size of the ring in cyclic glucose.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Glucose is an aldohexose, gives n-hexane with HI, and does not give Schiff's test, so statements A, B and D are true.

  2. Glucose exists in the six-membered pyranose form, not the furanose form. The statement that is not true is (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Identifies (C) as the false statement (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Biomolecules, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 56/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.