Question

Which of the following is the correct IUPAC name for the following compound?

• A. 2-(1,1-dimethyl ethyl)-5-(1-methyl ethyl) heptane
• B. 2-(1,2-dimethyl ethyl)-5-ethyl-6-methyl heptane
• C. 3-ethyl-2,6,7,7-tetramethyl octane
• D. 6-ethyl-2,2,3,7-tetramethyl octane

Answer 1

The correct option is D 6-ethyl-2,2,3,7-tetramethyl octane

Rules for Naming Hydrocarbons:-

Rule-I Selection of the longest carbon chain.

Rule-II Numbering the longest chain: Longest chain is numbered starting from a terminal carbon. Numbering is done is such a way that lowest possible number is given to the side cahin or a functional group.

Rule-III Writing names of branched, saturated hydrocarbons, locants are written first in alphabetical order followed by name of parent chain.

Rule-IV Some common names are retained in $IUPAC$ system for unsubstituted hydrocarbon only.

Option (D) 6-ethyl-2,2,3,7-tetramethyl octane is the answer.

(Refer to Image)

For $8$-carbon atom $⟶$ Octane.

For $-C{H}_3$ group $⟶$ Methyl.