Question

Draw all the structural and geometric (cis-trans) isomers of ${\mathbf{\text{C}}}_{\mathbf{4}}{\mathbf{\text{H}}}_{\mathbf{7}}\mathbf{}\mathbf{\text{F}}$(Hint: Refer to Exercise 25.)

Short answer

The eleven possible isomers are:

Step-by-step solution

All the structural isomers of C4H7F.

The structural isomersare the ones that have a similar number of atomsbut are completely different compounds.

Here, the compounds have atoms arranged differently and therefore they have all the physical and chemical properties different.

There are 8 structural isomers and from them, only 3 can form geometrical isomers.

All the geometric (cis-trans) isomers of C4H7F.

In geometric isomerism, the compounds have atoms bonded similarly. Here, the two bulky groups on the doubly-bonded carbon atoms are one time on the opposite side (TRANS) and one time on the similar side (CIS).

The terminal alkene with 2-H atoms cannot form cis-trans isomers as the condition for CIS-TANS isomerism is that both the doubly-bonded carbon atoms should be attacked to two different substituents. The example of the compounds that cannot show cis-trans isomerism is shown below.