Today in school, my teacher was explaining the different types of alkenes. Examples included ethene, propene, and butene. She also showed us their structural formulas.
I tried to draw butene's formula and came up with this:
Is it correct?
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$\begingroup$ Welcome to chemistry.SE! If you had any questions about the policies of our community, please visit the help center. $\endgroup$ – M.A.R. Nov 23 '15 at 15:42
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2$\begingroup$ Correct; and the more common example is 1-butene: H2C=CH-CH2-CH3 $\endgroup$ – khaverim Nov 23 '15 at 16:41
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1$\begingroup$ And there are also the cis- and trans- forms of 2-butene. And if one just went by the molecular formula, there's cyclobutane and methylcyclopropane as well. $\endgroup$ – orthocresol♦ Nov 23 '15 at 21:34
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Yes, the formula you drew is an example of isobutylene. Isobutylene has the "official" IUPAC name of 2-methylpropene, and is an important industrial chemical. Because it:
- has a formula of $\ce{C4H8}$, and thus contains four carbon atoms;
- contains a carbon-carbon double bond;
- and doesn't contain any other functional groups
... it is indeed an isomer of butene (sometimes known as butylene). You got this one right!$%edit$
