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Certain organic compounds… (Class 12 Chemistry 2024, Q30a)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/5/1 · 4 marks · Case-based

CBSE Class 12 Chemistry 2024: question 30(a)

Set in the CBSE Class 12 board exam of 2024, paper 56/5/1, section D, question 30(a), for 4 marks. Try it first; the hints and our step-by-step solution are below.

Q30(a) · 4 marks · Case-basedCompetency-basedBiomolecules

Certain organic compounds are required in small amounts in our diet but their deficiency causes specific disease. These compounds are called vitamins. Most of the vitamins cannot be synthesized in our body but plants can synthesize almost all of them. So they are considered as essential food factors. However, the bacteria of the gut can produce some of the vitamins required by us. All the vitamins are generally available in our diet. The term 'vitamin' was coined from the words vital + amine, since the earlier identified compounds had amino group. Vitamins are classified into two groups depending upon their solubility in water or fat namely-fat soluble vitamins and water soluble vitamins.

Answer the following questions :

  1. (a)

    What is the other name of vitamin ?

    1 mark
  2. (b)

    Name the vitamin whose deficiency causes increased blood clotting time.

    1 mark
  3. (c)

    Xerophthalmia is caused by the deficiency of which vitamin ? Give two sources of this vitamin.

    2 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 56/5/1.

Hints

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

Hint 1

Recall the NCERT table of vitamins, their sources and deficiency diseases.

Hint 2

The vitamin for vision and the cornea is fat soluble and found in carrots.

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) Vitamin is pyridoxine.

    1 mark

  2. (b) Deficiency of vitamin K increases blood clotting time.

    1 mark

  3. (c) Xerophthalmia (hardening of the cornea) is caused by deficiency of vitamin A.

    1 mark

  4. (c) Sources: fish liver oil, carrots (also butter, milk).

    1 mark

Answer: (a) Pyridoxine; (b) Vitamin K; (c) Vitamin A – fish liver oil, carrots

Where the marks are

  • Pyridoxine (1 mark)
  • Vitamin K (1 mark)
  • Vitamin A (1 mark)
  • Any two sources (½ + ½ marks)

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 paper2024 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.