Chapter 2, Problem 2.45E

(a)

Interpretation Introduction

Interpretation:

The most important Lewis structure of ${\text{H}}_2\text{C=CHCHO}$ along with equivalent resonance structures and formal charges has to be drawn.

Concept Introduction:

Lewis structures represent covalent bonds and describe valence electrons configuration of atoms. The covalent bonds are depicted by lines and unshared electron pairs by pairs of dots. The sequence to write Lewis structure of some molecule is given as follows:

• The central atom is identified and various other atoms are arranged around it. This central atom so chosen is often the least electronegative.
• Total valence electrons are estimated for each atom.
• single bond is first placed between each atom pair.
• The electrons left can be allocated as unshared electron pairs or as multiple bonds around the right symbol of the element to satisfy the octet (or duplet) for each atom.
• Add charge on the overall structure in case of polyatomic cation or anion.

(b)

Interpretation Introduction

Interpretation:

Composition of the bonds and the hybridization of each lone pair in ${\text{H}}_2\text{C=CHCHO}$ have to be drawn.

Concept Introduction:

Refer to part (a).