Question

The IUPAC name of the well known terpene camphor having the structure is:

• A. 6-oxo-1,2,2-trimethylbicyclo[2.2.1]heptane
• B. 1,7,7-trimethyl bicyclo[2.2.1]heptane-2-one
• C. 1,5,5-trimethyl bicyclo[2.1.1]hexane-2-one
• D. 1,7,7-trimethyl bicyclo[2.1.2]heptane-2-one

Answer 1

Answer: (B)

1,7,7-trimethyl bicyclo[2.2.1]heptane-2-one

The IUPAC name of the given terpene is 1,7,7-trimethyl bicyclo [2.2.1] heptane-2-one
The parent hydrocarbon is a bicyclo compound containing 7 carbon atoms. Hence, it is named as bicyclo [2.2.1] heptane.

The first position is given to bridge atom and then, to the carbon with priority i.e. bearing substituents or functional group along the longest chain. Then the carbon atoms at the shorter chains are numbers.

Three methyl groups are present as substituents on first and seventh carbon atom.
A carbonyl group is present at a second carbon atom.