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Assertion (A) : The… (Class 12 Chemistry 2026, Q16)

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ChemistryCBSE Class 12 · Board exam 2026, set 56/1/1 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry 2026: question 16

Set in the CBSE Class 12 board exam of 2026, paper 56/1/1, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · Assertion-reasonCompetency-basedBiomolecules

Assertion (A) : The pentaacetate of glucose does not react with .
Reason (R) : It indicates the presence of free – CHO group in glucose.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 56/1/1.

Hints

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

Hint 1

Hydroxylamine reacts with a free aldehyde group.

Hint 2

No reaction means the –CHO group is not free.

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 pentaacetate does not react with hydroxylamine, so A is true.

  2. This shows the absence of a free –CHO group (glucose exists in a cyclic hemiacetal form), so R is false. Option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • A is true and R is false (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 paper2026 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.