Question

The IUPAC name of methyl isopropyl ketone
A. 3-methyl-2-pentanone
B. 3-methyl butan-2-one
C. 2-pentanone
D. 2-methyl pentanone

Answer 1

Hint: We know that IUPAC name is the name given to any compound by the method of IUPAC nomenclature. IUPAC nomenclature is the method of naming the chemical compounds on the basis of standards provided by the IUPAC i.e. International Union of Pure and Applied Chemistry.

Complete answer
Ketone refers to the set of organic compounds/ hydrocarbons with the chemical structure $RC=O{R}^{\prime }$, where R and R’ are the substituents. These substituents contain carbon. The functional group of ketone is known as the carbonyl group represented by $-\mathrm{C}=\mathrm{O}-$.
From the name itself it is clear that Methyl Isopropyl ketone is an organic compound belonging to the ketone group. The functional group contained in this compound is the carbonyl compound. The chemical formula of methyl isopropyl is ${\mathrm{C}}_5{\mathrm{H}}_{10}\mathrm{O}$. Structurally, the methyl isopropyl ketone can be represented as;

With the help of structural formula, we can determine the IUPAC name of the methyl isopropyl ketone. The longest chain containing carbon is a chain of four carbons. So the parental name will be butane. The functional group ketone is attached to the second carbon atom of the chain as well as the substitute containing one carbon atom is attached to the third carbon atom of the parent chain. Therefore, the IUPAC name of methyl isopropyl ketone is 3-methylbutan-2-one.

Hence, option (B) 3-methyl butan-2-one, is the correct option.

Note:
Thus, upon the basis of the standards laid down by the IUPAC, it is clear that the IUPAC name of methyl isopropyl is 3-methylbutan-2-one. It is a colourless organic compound with acetone like odour.