IUPAC Nomenclature - Problem 1
Description:
Q1. Select the correct IUPAC name for the structure given below.
a) 5-methyl-5-ethyloctane
b) 5-methyl-5-propylheptane
c) 4-ethyl-4-methyloctane
d) 3-methyl-3-propyloctane
e) 3-methyl-3-propylheptane
Explanation − To write the IUPAC name of the given structure, lets first identify
the longest/parent chain- determines the number of carbon atoms
Principal functional Group – acts as suffix
Substituents and its positions – acts as prefix.
The longest chain has 8 −carbon atoms ′oct′.
There are no functional groups, and it is a straight chain alkane, thus suffix ends with ′ − ane′.
Substituents (prefix) are: methyl and ethyl (preference is given alphabetically if the positions of substituents are same).
Numbering is done such that the branched carbon gets the lowest number.
Correct Answer − (C) 4−Ethyl − 4 − methyloctane