Published by:
CGP EDU Academic Team
Published on: August 14, 2026
In addition to the standard ring systems (such as cyclohexane), cyclic compounds can also be bicyclic, tricyclic, etc. or they can be spirocyclic, bicyclic or bridge head carbons. The point of attachment of two rings are called bridge head atoms.The formal names of bicyclic and related ring systems are based on
A
Total number of atoms in the molecule. cyclo [1.2.2] heptanes [3.2.1] 
B
The number of atoms in each bridge connecting the bridge atoms. These numbers are written in square bracket in decreasing order. Spirocyclic compounds have two fused rings, but only one bridge head atom. Spirocyclic compounds are named like bicyclic compounds, but have the prefix spirocyclo. Answer the following questions (i) 
What is the IUPAC name of the above compound? Bicyclo [1.2.2] heptanes [3.1.0] 
What is the IUPAC name of the above compound? Bicyclo [1.2.2] heptanes [3.1.0]
C
Bicyclo [2.2.1] heptanes [1.3.0] 
D
cyclo [2.2.1] heptanes (ii) 
The number of atoms in each bridge are- [2.1.0] (iii) Which of the following is the correct structure of bicyclo [1.1.0] butane ? 
The number of atoms in each bridge are- [2.1.0] (iii) Which of the following is the correct structure of bicyclo [1.1.0] butane ?
Text Solution
Verified by ExpertsThe correct answer is:
C
(i)
Sol. Bicyclo [2.2.1] heptanes
(ii)
Sol. [3.1.0]
(iii)
Sol. 
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