What is the correct name of the compound that is incorrectly named 1-chloro-3-pentyne?

The correct name of the compound is .

Further explanation:

The IUPAC naming of an organic compound is the systematic way to write the name of organic compounds. The IUPAC name has three parts: root name, suffix, and prefix. The carbon atom number present in the parent chain is represented by the parent chain. The functional group present in the organic compound is represented by suffix and the name and number of the substituent present on the parent chain are represented by the prefix. The IUPAC name of the organic compound can be as follows:

(substituent number) - (substituent name)(root name)(suffix)  

The incorrect name of compound is 1-chloro-3-pentyne. The structure according to incorrect name is attached in the image.

The organic compounds are named according to IUPAC. The steps to determine the correct IUPAC name of the compound is as follows:

Step 1: Firstly, we identify the longest continuous carbon chain.

The longest carbon chain in the given molecule consists of 5 carbon atoms. The two carbon atoms are bonded by triple bond, and therefore the functional group is alkyne. Therefore due to presence of 5 carbon atom and triple bond the name of the parent chain is pentyne.

Step 2: In this step, the parent chain must be numbered so that the position of the triple bond should get the lowest number. Therefore the triple bond in given molecule is in between second carbon and third carbon atom, and the name of chain will be 2-pentyne.

Step 3: In this step, we identify the substituent or branched group that is attached to the parent carbon chain.

In the given molecule, the chlorine (Cl) group is attached to the parent chain. As preference is given to carbon atom having triple bond the number of carbon atom to which chlorine group is attached will be 5th carbon atom in the parent chain.

Hence, the correct name of molecule is 5-chloro-2-pentyne.

Learn more:

1. Draw three contributing structure of ion:.

2. Draw cis and trans isomers of but2ene:.

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: IUPAC nomenclature

Keywords: IUPAC, hydrocarbons, alkynes, unsaturated hydrocarbons, saturated hydrocarbons, 5-chloro-2-pentyne.