The 2004 IUPAC names for alkyl groups are derived from the alkane having the same carbon c...

The 2004 IUPAC names for alkyl groups are derived from the alkane having the same carbon chain as the alkyl group. The -e ending of that alkane is replaced by -yl, and the chain is numbered from the end that gives the carbon at the point of attachment its lower , number. This number immediately precedes the -yl ending and is bracketed by hyphens.

Name the C4H9 alkyl groups according to this system.