Which of the correct IUPAC names of the following compound ? H_3C-CH_2-CH_2-overset(HC(CH_3)_2)overset|"CH"-undersetunderset(H_3C-CH-CH_2CH_3)|"CH"-CH_2-CH_2-CH_2-CH_2-CH_3

Which of the correct IUPAC names of the following compound ? H_3C-CH_

1.	Which of the correct IUPAC names of the following compound ? H_3C-CH_2-CH_2-overset(HC(CH_3)_2)overset\|"CH"-undersetunderset(H_3C-CH-CH_2CH_3)\|"CH"-CH_2-CH_2-CH_2-CH_2-CH_3
Answer» 5-Butyl-4-isopropyldecane 5-Ethyl-4-propyldecane 5-sec-Butyl-4-isopropyldecane 4-(1-methylethyl)-5-(1-methylpropyl) decane Solution :ALTHOUGH IUPAC NAME for sec-butyl and isopropyl groups are 1-methylpropyl and 1-methylethyl respectively yet both these NAMES also RECOMMENDED for IUPAC nomenclature .