# How does the structuaral formula of butane and butene differ?

May 11, 2018

You gots ${C}_{4} {H}_{10}$ versus ${C}_{4} {H}_{8}$...the LATTER formula has ONE so-called degree of unsaturation.

#### Explanation:

And ${C}_{4} {H}_{10}$ can form TWO structural isomers. Butylene can form FOUR structural or geometric isomers...the which are...

${H}_{2} C = C - C {H}_{2} C {H}_{3}$ $\text{1-butylene}$

${H}_{3} C - C H = C H C {H}_{3}$ $\text{2-butylene}$; how many geometric isomers can this form...?

$\text{isobutylene}$ ${\left({H}_{3} C\right)}_{2} C = C {H}_{2}$

${C}_{4} {H}_{8}$ can FORM TWO ring structures (and the ring ALSO REPRESENTS one degree of unsaturation). What are these?