Question

Name the following compounds.

Short answer

a. The name of the given compound is cis-1-bromo-prop-1-ene.

b. The name of the compound is cis-4-ethyl-3-methyl-hept-3-ene.

c. The name of the compound is trans-1,4-diiodo-2-propyl-1-pentene.

Step-by-step solution

Subpart (a)Name of the compound.

• The root name will be "prop" since the longest chain is made up of three carbon atoms.
• The carbon-carbon double bond indicates that the root name in the suffix will be "ene” because of the double bond.
• When the bulky substituents (higher priority groups) are on the same side of the double bond, it is cis-isomer.
• When the bulky substituents (higher priority groups) are on the opposite side of the double bond, it is a trans-isomer.

As a result, here the compound's name would be cis-1-bromo-1-propene.

Subpart (b) Name of the compound.

• The root name will be "hept" since the longest chain consists of seven carbon atoms.
• The carbon-carbon double bond indicates that the root name in the suffix will be "ene” because of the double bond.
• The presence of substituents on the same side of the double bond indicates that this molecule is a "cis" isomer, with two groups one (3-methyl) and the other one ". (4-ethyl).

As a result, the compound's name would be cis-4-ethyl-3-methyl-3-heptene.

Subpart (c) Name of the compound.

• The root name will be "pent" because the longest chain has five carbon atoms.
• The carbon-carbon double bond indicates that the root name in the suffix will be "ene” because of the double bond.
• The presence of substituents on the other side of the double bond indicates that this molecule is a "trans" isomer with two iodide atoms.
• As a substituent, one propyl group is added to the second carbon atom, although its location is unrelated to the isomerism.
• As a result, the compound's name would be trans-1,4-diiodo-2-propyl-1-pentene.