Question

IUPAC name of $C{H}_{3}C{H}_{2}C{H}_2\underset{C{H}_{2}OH}{\underset{|}{CH}}-C{H}_{2}C{H}_3$ is:

• A. 3 -propylbutan-1-ol
• B. 2-Ethylpentan - 1 - ol
• C. 3- methyl hydroxyhexane
• D. 2- ethyl -2 - propyl ethanol

Answer 1

The correct option is B 2-Ethylpentan - 1 - ol

Steps to name an organic molecule:

1. Identify the functional group: OH in the given molecule. Alcohol i.e suffix "ol" will come.

2. Identify parent chain: The longest carbon chain that contains the functional group. Here its 5 C chain and not 4 C chain i.e pentane.

3. Assign locant number: lowest number to the main functional group and side chains i.e. 1-ol and 2-ethyl

4. Identify side chains/groups: its ethyl, in the given molecule.

IUPAC name is: 2-Ethylpentan-1-ol