Q1. [1] § 4.2 VERSATILE NATURE OF CARBON § 4.2.2 Chains, Branches and Rings
The number of single and double bonds present in a molecule of benzene (C₆H₆) respectively, are :
- A 6 and 6
- B 9 and 3
- C 3 and 9
- D 3 and 3
Previously asked in CBSE board exam
2024 31/4/1 Q5
Generated by claude-sonnet-4-6 · 2026-06-15 06:47 · grounding rag
Model Answer
Option D: 3 and 3 — Wait, that is incorrect. Benzene (C₆H₆) has an alternating structure with 3 single C–C bonds, 3 double C=C bonds, and 6 C–H single bonds, giving 9 single bonds and 3 double bonds.
Correct answer: B — 9 and 3
Source: Chapter 4, Section 4.2.2 (Chains, Branches and Rings)
---
Explanation
- In benzene's ring: there are 3 C–C single bonds and 3 C=C double bonds.
- Each of the 6 carbon atoms also bonds to one hydrogen via a single bond → 6 C–H single bonds.
- Total single bonds = 3 (C–C) + 6 (C–H) = 9; double bonds = 3.
- Examiners expect you to count all single bonds (both C–C and C–H), not just the ring single bonds. Option D (3 and 3) is a common wrong answer if students ignore C–H bonds.
If a question refers to an image, map, graph or diagram that is not shown here, find the actual CBSE question paper on the CBSE website:
cbse.gov.in.