Question

For the nomenclature of the hydrocarbon given in the following diagram, the carbon to the right will be the 1st carbon in the main chain. What is the name of the given compound?

• A. Heptanone
• B. Hex-2-enone
• C. Hex - 4-en- 2-one
• D. Hexanoic acid

Answer 1

The correct option is C

Hex - 4-en- 2-one

The above compound has a double bond and a ketone functional group. The primary suffix in alkenes is “ene”. The secondary suffix for ketones is “one”. It is given that the rightmost carbon is the first carbon in the main chain. So we can give numbers to the carbons in the compound, as shown below.

Now while writing the chemical name, we have to mention the position of the double bond and suffix of the functional group ketone in the name. Hence, the name of the compound is “Hex - 4 - en- 2 - one.”