I need know name of this compound CH3 - CH2 - CH(C2H5) - CH2 - CH(CH3) - CH2 - CH3
The root word for this molecule is "hept-" since the longest chain contains 7 carbons. In this molecule, both methyl and ethyl groups are at equivalent positions. However the ethyl group comes first in the alphabetical order. Therefore it is to be written first in the name and to be given the lowest number. So, the name of this compound is 3-ethyl-5-methylheptane.