Chapter 8, Problem 94IL

(a)

Interpretation Introduction

Interpretation:

The bonds in 2-deoxyribose has to be ranked in terms of increasing polarity.

Concept introduction:

Polar covalent bond involves an unequal sharing of electrons between two bonded atoms; it creates a partial separation of charge and a dipole moment.

Covalent bonds are polar, if there is a difference in electronegativity between the bonded atoms.

(b)

Interpretation Introduction

Interpretation:

The expected $C-O-C$, $O-C-C$ and $C-C-C$ bond angles in the $C_{4}O$ ring has to be determined.

Concept introduction:

• In VSEPR, the geometry of the molecule is explained based on minimizing electrostatic repulsion between the molecules’ valence electrons around a central atom
• Bond angle is the angle between two bonds of a molecule and it is determined based on the electron-domain geometry.

  [Bond angles: tetrahedral = $\text{109}{\text{.5}}^{\text{o}}$, trigonal planar = ${\text{120}}^{\text{o}}$, T-shape = ${\text{90}}^{\text{o}}$]

Electron geometry is the shape of a molecule predicted by considering both bond electron pairs and lone pair of electrons.

Molecular geometry is the shape of a molecule predicted by considering only bond pair of electrons.