Question

Which are the correct IUPAC names of the following compound?

(a) 5-Butyl-4-isopropyldecane
(b) 5-Ethyl-4-propyldecane
(c) 5-sec-Butyl-4-iso-propyldecane
(d) 4-(1-methylethyl)-5−(1-methylpropyl)-decane

Answer 1

Hint: The given structure is an alkane. IUPAC nomenclature of alkane follows a few steps – identifying the longest straight chain, and substituted groups. Then naming them accordingly and putting them together. IUPAC name is the universally accepted name of the compound.

Complete answer:
To name natural mixtures you should initially remember a couple of essential names. These names are recorded inside the conversation of naming alkanes. By and large, the base piece of the name mirrors the number of carbons in what you have allocated to be the parent chain. The postfix of the name mirrors the type(s) of useful group(s) present on (or inside) the parent chain. Different gatherings which are joined to the parent chain are called substituents.

Naming the given structure –
-Identify the longest chain i.e. the longest chain is of ten carbons.
-There are two substitutions – at fourth and fifth carbon
-At fourth carbon, 1-methylethyl is present.
-At fifth carbon, 1-methylpropyl is present.
-Now, putting it together, the name will be 4-(1-methylethyl)-5−(1-methylpropyl)-decane.

Note:
The names of all alkanes end with - ane. Regardless of whether the carbons are connected start to finish in a ring (called cyclic alkanes or cycloalkanes) or whether they contain side chains and branches, the name of each carbon-hydrogen chain that does not have any twofold bonds or useful gatherings will end with the addition - ane. Alkanes with unbranched carbon chains are essentially named by the number of carbons in the chain.