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The number of single and… (Class 10 Science 2024, Q5)

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ScienceCBSE Class 10 · Board exam 2024, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 5

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, section A, question 5, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q5 · 1 mark · MCQCarbon and its Compounds

The number of single and double bonds present in a molecule of benzene respectively, are :

  1. (A)6 and 6
  2. (B)9 and 3
  3. (C)3 and 9
  4. (D)3 and 3

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/4/1.

Hints

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

Hint 1

Draw the ring with alternate double bonds.

Hint 2

Do not forget the C–H bonds.

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. The benzene ring has alternate bonds: 3 C=C double bonds and 3 C–C single bonds.

  2. There are also 6 C–H single bonds, so single bonds and double bonds .

    1 mark

Answer: (B) 9 and 3

Where the marks are

  • Counts 9 single and 3 double bonds (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Carbon and its Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/4/1: 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.