Question

Write the IUPAC name of \[{C_3}{H_8}\].
A.Methane
B.Ethane
C.Methylethane
D.Propane
E.isopropane

Answer 1

Hint: We must know that the prefix for the 3 carbon chain is prop and the suffix for carbon chain with no unsaturation is –ane, double bonds is –ene and for triple bonds is –yne.

Complete step by step answer:
Let’s start with discussing the IUPAC and the IUPAC nomenclature for better understanding of the question. IUPAC is the abbreviation for the International Union of Pure and Applied Chemistry is the organization which is responsible for taking the decisions in the area of chemistry. This organization makes the standards for chemistry as well as gives the name to the compounds.
To find the name of the compound we need to follow some basic steps. The steps are given below:
First we need to find the longest carbon chain.
Then we will identify the groups attached to it.
If no group attach then check for unsaturation (double or triple bonds)
If no double bond it is alkane so use the suffix –ane, if one double bond then use –ene and if triple bond is present then use –yne.
In our question we are provided with ${C_3}{H_8}$, so the longest chain will be of 3 carbons and since 2n+2 hydrogens are there (n is the number of carbon atoms) i.e. 8 Hydrogen, this means that no unsaturation is present. So, the prefix will be prop and suffix will be –ane, hence the name of the compound given is propane.

$\therefore $The answer to this question is option D. propane.

Note:
We must know that the IUPAC is an international authority which deals with almost every problem in the field of science. From naming the compounds to giving standards all this is done by IUPAC. Many countries follow the rules and regulations followed by the IUPAC.