For each of the following molecules, indicate the...

For each of the following molecules, indicate the hybridization of each carbon and give the approximate values of all the bond angles: a. $\quad \mathrm{CH}_{3} \mathrm{C} \equiv \mathrm{CH}$ b. $\quad \mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}$ c. $\quad \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}$ d. $\quad \mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}$

For each of the following molecules, indicate the hybridization of each carbon and give the approximate values of all the bond angles:
a. $\quad \mathrm{CH}_{3} \mathrm{C} \equiv \mathrm{CH}$
b. $\quad \mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}$
c. $\quad \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}$
d. $\quad \mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}$

Key Concepts

Sigma and Pi Bonds

Multiple bonds, such as double and triple bonds, consist of sigma (?) bonds and pi (?) bonds. The sigma bond forms from the head-on overlap of hybrid orbitals and determines the primary structure and geometry of the molecule, while the pi bond(s) form from the lateral overlap of unhybridized orbitals, affecting electron density distribution but not the basic framework of the molecular shape.

Bond Angles

Bond angles are the angles between adjacent bonds emanating from a common atom and are influenced by the hybridization of the atom. In sp hybridization, the bond angle is approximately 180°; in sp2, it is about 120°; and in sp3, it is close to 109.5°. These angles are fundamental in predicting and understanding molecular geometries.

VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) theory is a model used to predict the three-dimensional arrangement of atoms within a molecule. It is based on the idea that electron pairs around a central atom will arrange themselves as far apart as possible to minimize repulsion, thereby determining bond angles and molecular shape.

Atomic Hybridization

Atomic hybridization involves the mixing of atomic orbitals to form new orbitals (such as sp, sp2, and sp3) that are better oriented for bonding. Each type of hybridization corresponds to a distinct molecular geometry: sp leads to a linear arrangement, sp2 to a trigonal planar arrangement, and sp3 to a tetrahedral arrangement.

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