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The valence electrons in a particular molecule can be depicted with the help of Lewis structures.

The lone pairs of a molecule are also shown in a Lewis structure.

Resonance structures help in understanding the bonding that is occurring in a particular molecule.

The double bond equivalence for the molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$is given below:

$\begin{array}{rcl}\mathrm{D}.\mathrm{B}.\mathrm{E}& =& \frac{1}{2}\left[\left(2×3\right)+2-6\right]\\ & =& 1\end{array}$

Thus, the possible compounds for molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$can contain one cyclic ring or alicyclic double bond. Therefore, the possible isomers can be aldehydes, ketones, enols, and cyclic ethers. The isomers of ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$ are given below:

Representation of the isomers of ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$

The Lewis structures of ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$are given below:

Representation of the Lewis structures of ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$