Q43E - Organic Chemistry (Mcmurry)

Question

Question. Draw and name the six alkene isomers, C₅H₁₀ , including E, Z isomers:

Step-by-Step Solution

Answer

Answer 

The six isomers having the formula C₅H₁₀  are drawn below.

Step 1: Definition of isomers

Isomers are those compounds which have same molecular formula but different structures. Isomers are further classified into structural isomers and geometric isomers. In structural isomers the position of the substituents are different. In geometric isomers orientation of groups across a double bond are different. Geometric isomers are classified as cis and trans isomers. They can also be assigned E or Z configuration

Step 1: Degree of unsaturation

Degree of unsaturation defines how many multiple bonds present in the compound.

Firstly we have to calculate the degree of unsaturation from the molecular formula. 

 $$\begin{gathered} Degree of unsaturation=C-\frac{H}{2}-\frac{X}{2}+\frac{N}{2}+1 \\ =5-\frac{10}{2}+1 \\ =1 \end{gathered}$$

 

Since, the degree of unsaturation is equal to 1, so there must be only one double bond present in the molecule.

 

Step 3: Isomers of C 5 H 10

Alkene isomers can be drawn by drawing different structures with the same molecular formula.

All the isomers of the compound having molecular formula are given below.