please post explanation.

tep 2. Identify and name the branches on the longest continuous chain. Names of branches (alkyl groups) are derived from the name of the alkane with the same number of carbons by replacing the suffix "ane" with yl.: ..9. CH2CH2CH3 is propane - ane +yl= propyl - When multiple branches are present they are named in alphabetical order (e.g. butylmethyl, not methylbutyl). CH3CH2CHCH2CH2CH2CH3CH2CH2CH2 The name for this branch is x