Answer:

Iupac name list with structure

Number

Parent Alkane Alkyl Group Condensed Structural Formula

ethane ethyl CH3CH2–

propane propyl CH3CH2CH2–

isopropyl (CH3)2CH–

butane butyl* CH3CH2CH2CH2–

second answer:

The longest continuous chain has 5 C atoms. Two ethyl substituents are present on third C atom. Hence, the IUPAC name of the given structure is 3,3 - diethyl pentane.