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What are the isomers of #C_4H_8#?

Answer 1

I count 5 structural isomers............

There is a geometric isomer for one of the structural isomers.

#"1. cyclobutane"#; #"2. methylcyclopropane"#; #"3. 1-butylene"#; #"4. 2-butylene"#; #"5. 2-methylpropene"#.

#"2-butylene"# can of course generate 2 geometric isomers, which are?

Just to add a bit more method to the analysis. It is a fact that an alkane has general formula #C_nH_(2n+2)#. In this analysis, an halide counts for #H#, oxygens are ignored (they can be carbonyls or alcohols or ethers), and if there is a #N# in the compound, we subtract #NH# from the given formula. Each 2 hydrogens less than this formula corresponds to a degree of unsaturation. A degree of unsaturation corresponds to an olefinic bond, OR a ring junction. Thus I knew that the possible isomers of #C_4H_8# were olefins, OR #"3- or 4-membered rings"#.

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Answer 2

Elias Aguila

Butene and Isobutene

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.