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Answer the following. (Class 12 Chemistry 2026, Q20)

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ChemistryCBSE Class 12 · Board exam 2026, set 56/5/1 · 2 marks · Very short answer

CBSE Class 12 Chemistry 2026: question 20

Set in the CBSE Class 12 board exam of 2026, paper 56/5/1, section B, question 20, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q20 · 2 marks · Very short answerBiomolecules

Answer the following.

  1. (a)

    What are the products obtained on hydrolysis of sucrose ?

    1 mark
  2. (b)

    What are essential amino acids ?

    1 mark

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 56/5/1.

Hints

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

Hint 1

Sucrose is a disaccharide made of one aldohexose unit and one ketohexose unit.

Hint 2

Essential amino acids are named for where they must come from.

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. (a) Hydrolysis of sucrose gives an equimolar mixture of D-(+)-glucose and D-(–)-fructose (invert sugar).

    1 mark

  2. (b) Essential amino acids are amino acids that the human body cannot synthesise, so they must be obtained through the diet. Examples are valine, leucine and lysine.

    1 mark

Answer: (a) Glucose and fructose; (b) amino acids not synthesised in the body, which must come from the diet

Where the marks are

  • Glucose (½ mark) and fructose (½ mark)
  • Correct definition of essential amino acids (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 56/5/1: 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.