# Ignoring geometric and optical isomers, how many different structural isomers exist with the formula C_5H_10?

Apr 29, 2016

Well I can count 9. There may be more.

#### Explanation:

There are at least 4 olefins, and 5 alicyclic species. Most of these species have geometric isomers.

Apr 29, 2016

Total 10 Structural isomers (5open chain and 5 cyclic)

#### Explanation:

The hydrocarbons having General molecular formula ${C}_{n} {H}_{2 n}$ corresponds to alkane (saturated open chain HC) having General formula ${C}_{n} {H}_{2 n + 2}$

'All open structure of ${C}_{n} {H}_{2 n}$ is unsaturated with one $C = C$ as it contains 2 hydrogen atoms less than its corresponding saturated compound. The names and the structures of all possible alkene are given below (1-5)

5 saturated cyclic structures are also possible, The names and the structures of all possible Cyclic Structures are given below (6-10)