Question

Give the IUPAC name for each aldehyde.

a.2-isobutyl-3-isopropylhexanal

b. trans-3-methylcyclopentanecarbaldehyde

c. 1-methylcyclopropanecarbaldehyde

d. 3,6-diethylnonanal

Short answer

a.

b

c

d

Step-by-step solution

IUPAC name of the carbonyl group

The first priority or number is given to the carbon of the carbonyl group. The suffix “al” is used in the parent name.

Structures of a, b, c, and d

a. The given compound has six carbon atoms in a chain. Aldehyde group, isobutyl group, and isopropyl group are attached to C-1, C-2, and C-3 atoms, respectively.

The structure of the given compound is shown below:

trans-3-methylcyclopentanecarbaldehyde

b. The given compound is composed of five carbon atoms in a cyclic form. Aldehyde group and methyl group are attached to C-1 and C-3 atoms, respectively. Both have different orientations in space.

The structure of the given compound is shown below:

trans-3-methylcyclopentanecarbaldehyde

c. The given compound has three carbon atoms in a cyclic form. Aldehyde group and methyl group are attached to the C-1 atom.

The structure of the given compound is shown below:

1-methylcyclopropanecarbaldehyde

d. The given compound has nine carbon atoms in a chain. Aldehyde group and ethyl groups are attached to C-1 and C-3, C-6 atoms, respectively.

The structure of the given compound is shown below:

3,6-diethylnonanal