Chapter 9, Problem 9.91QE

Interpretation Introduction

Interpretation:

The skeleton structure and Lewis structure of acrolein have to be determined.

Concept Introduction:

The bond result from the electrostatic force of attraction between oppositely charged ions is called ionic bond and the bond result from the mutual sharing of electrons between atoms is called the covalent bond. The Lewis electron-dot symbol can be used to describe the covalent bonds in molecules.

Two types of pairs of electrons are as follows:

1. Bonding pairs of electrons are shared between two atoms.

2. Lone or nonbonding, pairs of electrons are on one atom and are not shared.

Lewis structures are representations of the covalent bond. In this Lewis symbols show how the valence electrons are present in the molecule.

Steps to write Lewis structures are as follows:

1. The skeleton structure with single bonds between all bonded atoms has to be written

2. Sum the valence electrons of the atoms in the molecule.

(a) For cations, one electron is subtracted for each positive charge.

(b) For anions, one electron is added for each negative charge.

3. Subtract two electrons from total number of valence electrons for each bond in the skeleton structure.

4. Count the number of electrons required to satisfy the octet rule for each atom in the structure. If the number of electrons needed is less than the number remaining, add one bond for every two electrons needed between atoms to attain an octet.

5 The remaining electrons are placed as lone pairs on atoms that need them to satisfy the octet rule.