Question

Give the structure for each of the following.

a. 3-hexene

b. 2, 4-heptadiene

c. 2-methyl-3-octene

d. 4-methyl-1-pentyne

Short answer

a.

b.

c.

d.

Step-by-step solution

Definition of the alkenes and alkynes.

Alkyne is an unsaturated hydrocarbon with a carbon-carbon triple bond.

Hydrocarbons have empirical formulas that differ from one another. Alkynes and alkenes have less bound hydrogen than alkanes.

Step 2: Subpart (a)

Here, in the compound's given name, the root name is "hex" which means that the structure has six carbon atoms, and the prefix "3" means the third and fourth carbon atoms are connected by a double bond.

Step 3: Subpart (b)

Here, in the compound's given name, the root name is "hept" that means the structure has seven carbon atoms. The prefixes "2" and "4" means that there is a double bond between the second and third carbon atoms as well as between the fourth and fifth carbon atoms.

Step 4: Subpart (c)

Here, in the compound's given name and using the root name "oct" indicates that there will be eight carbon atoms in the structure, and the prefix "3" indicates that there is a double bond between the third and fourth carbon atoms. Before "methyl," by the number "2". Also, the second carbon atom has a methyl group bonded to it.

Step 5: Subpart (d)

Here, the compound's given name, infers the root name "pent" as the structure consists of the longest chain of five carbon atoms, and the prefix "1" means a double bond is present between the first and second carbon atoms.

So the fourth carbon atom has a methyl group linked to it because of the number "4" before the word "methyl."