Answer
The more common name for the ( 1-methylethyl ) group is: Propyl Group.
Work Step by Step
1. Write the biggest carbon chain, and number its carbons:
- It is: "ethyl", so we must draw this chain: $^1CH_3 - ^2CH_2-$
2. Now, add the other group:
- Since its represented by: "1-methyl", we should attach a methyl group ($CH_3-$) to the first carbon of the chain, which will lose a hydrogen to do such thing.
3. Finally, name it properly:
- As we can see at the top of page 92, ( 1-methylethyl ) is a "Propyl Group"