It is 'hexanoic acid' or 'caproic acid'.
what is the molecular formulae for 2-hydroxybenzoic acid
This is an impossible compound formula: at the 5th C there can be either ONE oxygen atom (-CO-) or 2 hydrogen atoms (-CH2-, not -CO2-);In those corrected cases the names would be eithern-nonanon-4: CH3CH2CH2CH2CH2C(O)CH2CH2CH3or n-nonaan : CH3CH2CH2CH2CH2C(H2)CH2CH2CH3