Question

Correct $IUPAC$ name for

• A. 2-sec-butylbutane
• B. 2-ethyl-3-methylpentane
• C. 2,3-dimethylbutane
• D. 3,4-dimethylhexane

Answer 1

The correct option is D

3,4-dimethylhexane

Identify the longest carbon chain

● The longest continuous carbons chain will be of six carbons atoms. The word root for six carbon chain is $‘{\text{hex}}^{\prime }.$

Numbering of carbons in the parent chain

● Numbering can be done from any end. In both cases substituents will occur at the same position.



IUPAC Name of the compound

While writing the name of compound, prefix $“\text{di}”$ is used because two methyl groups are present on parent chain and suffix $“\text{ane}”$ is used with word root, because the hydrocarbon is an alkane.

So, the name of the compound can be written as option (b) $3,4-$dimethylhexane.