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Question
Which of the following is a bicyclo compounds?
Which of the following is a bicyclo compounds?
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Solution
The correct option is B
Compounds with two fused cycloalkane rings are called bicyclo compounds. In other words, they are
two cycloalkane rings having two or more atoms in common.
Consider
Option (a) clearly according to the above definition, there are no common atoms.
Option (b) is definitely a bicyclo compound
Option (c) has multiple bonds in the fused rings. So it does not qualitfy.
Option (d) does not have 2 or more common carbon atoms.
Hence, answer is B
Note:
Option 'd' has exactly one carbon atom shared between two cycloalkane rings. This is a spiro compound.
The simplest spiro compound would be 
.
It has 5 carbon atoms.
Compounds with two fused cycloalkane rings are called bicyclo compounds. In other words, they are
two cycloalkane rings having two or more atoms in common.
Consider
Option (a) clearly according to the above definition, there are no common atoms.
Option (b) is definitely a bicyclo compound
Option (c) has multiple bonds in the fused rings. So it does not qualitfy.
Option (d) does not have 2 or more common carbon atoms.
Hence, answer is B
Note:
Option 'd' has exactly one carbon atom shared between two cycloalkane rings. This is a spiro compound.
The simplest spiro compound would be .
It has 5 carbon atoms.
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