isomers of C2H2O  

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Advanced level organic chemistry PART 14.7: Constitutional isomers of molecular formula C2H2O

Doc Brown's Advanced Level pre-university chemistry: Part 14.7

Structural isomers and stereoisomers of molecular formula C2H2O

[Author ©  Dr WP Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy and analysing the isomers of C2H2O [isomerism page updated Feb 9th 2026 *]

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 Associated organic chemistry page links

 This is a big chemistry website, please allow time to explore

Selected theoretical and actual constitutional isomers of molecular formula C2H2O

Introduction to the constitutional isomers C2H2O

Percent composition based on atomic masses C= 12.01  H = 1.01  O = 16.00, so  Mr(C2H2O) = 42.04

Element composition (to two dp): carbon = 57.14%     hydrogen = 4.80%     oxygen = 38.06%

Empirical formula = C2H2O = molecular formula = C2H2O

Some of the isomers described may be highly reactive and very thermodynamically unstable e.g. due to weak highly strained bonds, particularly ring compounds, and some may not even exist at all (except theoretically of course!).

They are all functional group isomers of each other.

I can't see any E/Z geometrical isomers or R/S optical isomers.

Not sure on some of the names? Help appreciated?

I've deduced 3 constitutional isomers of molecular formula C2H2O and I think that might be it?

Details of 3 selected constitutional isomers of molecular formula C2H2O

(1, names) ketene, ethenone

An open chain unsaturated aliphatic compound, the most stable of these three isomers

Number of low resolution NMR chemical shift δ signal peaks: 1 1H and 2 13C (email if disagree?)

 

(2, names) ethynol, hydroxyethyne, hydroxyacetylene

An open chain unsaturated aliphatic compound, alkyne and alcohol functional groups.

Number of low resolution NMR chemical shift δ signal peaks: 2 1H and 2 13C (email if disagree?)

1H NMR ratio of peaks: 1 : 1 (for non-equivalent protons)

 

(3) oxirene

a heterocyclic ring compound that has been stabilised at low temperatures.

Oxirene has a highly strained ring structure, a cyclic ether with a double bond.

Number of low resolution NMR chemical shift δ signal peaks: 1 1H and 1 13C (email if disagree?)

Associated isomer and spectroscopy organic chemistry links

Index of sets of isomers for a given molecular formula

Isomerism: introduction, structural isomerism - chain, positional, functional group, tautomerism

Stereoisomerism: introduction, definition, priority rules, E/Z isomerism (cis/trans geometrical isomerism)

Stereoisomerism - R/S isomerism (optical isomerism) - definition - examples explained

Index of all IR, mass, 1H NMR and 13C NMR spectroscopy pages

 This is a big chemistry website, please allow time to explore

Index of my advanced (pre-university) organic chemistry revision notes

 The chemistry of alkanes and the petrochemical industry

 The chemistry of alkenes

 The chemistry of haloalkanes

 The chemistry of alcohols

 The chemistry of aldehydes and ketones

 The chemistry of carboxylic acids and derivatives

 The chemistry of organo-nitrogen compounds

 The chemistry of aromatic compounds

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