Question

16 multiple choice 2 points provide an acceptable name for the alkane shown below: ch3 ch2ch3 ch3ch2chch2chch2chch2ch3 ch2ch2ch3 3 - ethyl - 5 - methyl - 7 - propylnonane 3 - ethyl - 7 - methyl - 5 - propylnonane 3 - methyl - 7 - ethyl - 5 - propylnonane 7 - ethyl - 3 - methyl - 5 - propylnonane

Explanation:

Step1: Identify the longest carbon - chain

The longest continuous carbon - chain has 9 carbon atoms, so the parent name is nonane.

Step2: Number the carbon - chain

Number the carbon - chain to give the substituents the lowest possible numbers. Starting from the end closest to a substituent.

Step3: Name the substituents

There is an ethyl group ($\text{CH}_2\text{CH}_3$) at the 3 - position, a methyl group ($\text{CH}_3$) at the 5 - position and a propyl group ($\text{CH}_2\text{CH}_2\text{CH}_3$) at the 7 - position.

Step4: Write the name

When naming, the substituents are listed in alphabetical order. So the name is 3 - ethyl - 5 - methyl - 7 - propylnonane.

Answer:

A. 3 - ethyl - 5 - methyl - 7 - propylnonane