How many isomers of #C_3H_4# are possible?

2 Answers
anor277
Jan 4, 2018

Well, it could be either.....

Explanation:

You assess the degree of unsatuation.

#C_3H_4# has 2 degrees of unsaturation.....this could be #"allene"#, #H_2C=C=CH_2#, or #"propyne"#, #HC-=C-CH_3#, or #"cyclopropene"#...

Each degree of unsaturation corresponds to a double bond, OR a ring junction.....

Meave60
Jan 4, 2018

There are three structural isomers of #"C"_3"H"_4#, propadiene, propyne, and cyclopropene. They all have at least one double bond between carbon atoms, and one has triple bonds between carbon atoms. Refer to the diagrams below.

Explanation:

The diagram below represents the structural formula of propadiene.

http://www.wikiwand.com/en/Allene

The diagram below represents the structural formula propyne.

http://www.chem.ucla.edu/~harding/IGOC/P/propyne.html

The diagram below represents the structural formula of cyclopropene.

https://commons.wikimedia.org/wiki

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