Which are the correct IUPAC names of the following compound?

(i) 5– Butyl – 4– isopropyldecane
(ii) 5– Ethyl – 4– propyldecane
(iii) 5– sec-Butyl – 4– iso-propyldecane
(iv) 4–(1-methylethyl)– 5 – (1-methylpropyl)-decane
 

Answers (1)

The answer is the option (iii) 5-sec-Butyl-4-iso-propyldecane & (iv) 4-(1-methylethyl)-5-(1-mrthylpropyl)-decane

Explanation: The longest carbon chain has 10 atoms, hence ‘decane’. According to the lowest sum rule, side chains are on 4th(isopropyl group) & 5th(sec-butyl group) carbon atoms. Isopropyl is called 1-Methylethyl group and sec-butyl is called 1-Methylpropyl group in IUPAC. Hence the correct names are in option (iii) & (iv).

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