Skip to content

Classify the following… (Class 12 Chemistry 2024, Q18)

questionbuddy.in/q/cbse-12-chemistry-2024-56-5-1-q18-classify-sugars-monosaccharides-disaccharides-galactose

ChemistryCBSE Class 12 · Board exam 2024, set 56/5/1 · 2 marks · Very short answer

CBSE Class 12 Chemistry 2024: question 18

Set in the CBSE Class 12 board exam of 2024, paper 56/5/1, section B, question 18, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q18 · 2 marks · Very short answerBiomolecules

Classify the following sugars into monosaccharides and disaccharides :
Galactose, Glucose, Lactose and Maltose

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

Ask whether each sugar can be hydrolysed into smaller sugar units.

Hint 2

Milk sugar and malt sugar are .

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. Monosaccharides (cannot be hydrolysed further): Galactose and Glucose, each .

    1 mark

  2. Disaccharides (each gives two monosaccharide units on hydrolysis): Lactose (gives galactose + glucose) and Maltose (gives two glucose units).

    1 mark

Answer: Monosaccharides: Galactose, Glucose; Disaccharides: Lactose, Maltose

Where the marks are

  • Galactose and glucose as monosaccharides (½ + ½ marks)
  • Lactose and maltose as disaccharides (½ + ½ marks)

Revise the chapter

  • Chapter: Biomolecules (notes, formulas, where marks are lost and every past question)
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.