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Select from the following a… (Class 10 Science 2025, Q4)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 4

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section A, question 4, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q4 · 1 mark · MCQCarbon and its Compounds

Select from the following a hydrocarbon having one C–C bond and one C≡C bond :

  1. (A)Benzene
  2. (B)Cyclohexane
  3. (C)Butyne
  4. (D)Propyne

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Count carbons: one single plus one triple bond needs how many?

Hint 2

Draw the structure .

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. Propyne is . It has three carbons joined by exactly one C–C single bond and one C≡C triple bond.

  2. Butyne has four carbons, so it has two C–C bonds. Benzene and cyclohexane have no triple bond. Option (D).

    1 mark

Answer: (D) Propyne

Where the marks are

  • Identifies propyne (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 paper2025 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.