Question

The number of structural isomers of ${\mathrm{C}}_5{\mathrm{H}}_{10}$ is ________.

Answer 1

Structural isomers

• Structural Isomers are two or more compounds that have the same chemical formula but the atoms are completely arranged in a different order.
• The difference in properties is due to the difference in structures.

Calculation of Double bond equivalent (DBE) in ${\mathrm{C}}_5{\mathrm{H}}_{10}$

$$\begin{gathered} \text{DBE=C+1-}\frac{\text{H}}{2}\text{-}\frac{\mathrm{X}}{2}\text{+}\frac{\text{N}}{2} \\ \text{=5+1-}\frac{10}{2} \\ \text{=1} \end{gathered}$$

Structural isomers of ${\mathrm{C}}_5{\mathrm{H}}_{10}$

• The degree of unsaturation for the formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ is 1 which indicates the presence of either a ring or a double bond in the structure.
• The structural isomers of ${\mathrm{C}}_5{\mathrm{H}}_{10}$ are as follows:-
• 

• So, the number of structural isomers of ${\mathrm{C}}_5{\mathrm{H}}_{10}$ is $10.$