Question

What is the correct IUPAC name of the $C{{H}_{3}}-CH(C{{H}_{3}})-CH(C{{H}_{2}}C{{H}_{3}})-CH(C{{H}_{3}})-C{{H}_{3}}$?
A. 3-isopropyl-2-methylpentane
B. 3-isopropyl-2,4-methylpentane
C. 2,4-dimethyl-3-ethylpentane
D. 3-isopropyl-4-methylpentane

Answer 1

Hint: IUPAC gives us some rules for the naming of organic compounds which can also be referred to as nomenclature of organic compounds. IUPAC stands for International Union of Pure and Applied Chemistry.

Complete Solution :
 IUPAC nomenclature gives us information on writing the name of chemical compounds. There are some general rules for it. To write the name of this compound we have to follow some rules.
a. At first select the longest chain of carbon atoms, in the given compound the longest chain is of 5 carbon atoms from left to right.
b. After that give the numbering to carbon atoms which are attached as side chains,
c. Now we can see that at 2nd and 4th position methyl groups are present which can be represented by 2,4-dimethyl, di used for two methyl groups and on 3rd position ethyl group is present which is defined by 3-ethyl
d. Given compound has 5 carbon atom chains so it is a pentane molecule and the IUPAC name of the compound will be 2,4-dimethyl-3-ethylpentane.
So, the correct answer is “Option C”.

Note: The main aim of the nomenclature IUPAC is to create an international standard for designating compounds to promote communication. The purpose of the system is to give a unique and unambiguous name to each structure so that no two structures' names get mixed or they can be identified easily.