Question

Give the IUPAC name for each ketone

a.

b

c

Short answer

a. 2-cyclohexylpentan-3-one

b. 3-tert-butyl-2-methylcyclopentanone

c. 2,2,4,4-tetramethylpentan-3-one

Step-by-step solution

IUPAC naming for carbonyl group

The numbering starts from the first carbon of the longest chain in which the ketone group is included. The suffix “one” suffix is used after the parent name.

IUPAC names of a, b and c

a. The given compound has five carbon atoms in a chain. Ketone and cyclohexyl groups are attached to C-3 and C-2 atoms, respectively.

The IUPAC of the given compound is shown below:

2-cyclohexylpentan-3-one

b. The given compound has five carbon atoms in a cyclic form. Ketone group, tert butyl, and methyl group are attached to C-1, C-3, and C-2 atoms, respectively.

The IUPAC of the given compound is shown below:

3-tert-butyl-2-methylcyclopentanone

c. The given compound has five carbon atoms in a chain. Ketone group and two methyl groups are attached to C-1 and C-2, C-4 atoms, respectively.

The IUPAC of the given compound is shown below:

2,2,4,4-tetramethylpentan-3-one