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Ch.9 - Molecular Geometry and Bonding Theories
Chapter 9, Problem 92b

Ethyl propanoate, CH3CH2COOCH2CH3, gives a fruity pineapple-like smell. (a) Draw the Lewis structure for the molecule, assuming that carbon always forms four bonds in its stable compounds. (b) How many s and how many p bonds are in the molecule?

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Lewis Structures

Lewis structures are diagrams that represent the bonding between atoms in a molecule and the lone pairs of electrons that may exist. They are based on the octet rule, which states that atoms tend to form bonds until they are surrounded by eight valence electrons. In drawing Lewis structures, it is essential to account for the number of valence electrons and ensure that each atom achieves a stable electron configuration.
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Types of Chemical Bonds

Chemical bonds can be classified into two main types: sigma (σ) and pi (π) bonds. Sigma bonds are formed by the head-on overlap of atomic orbitals and are the first bonds formed between two atoms. Pi bonds, on the other hand, result from the side-to-side overlap of p orbitals and are typically found in double and triple bonds. Understanding these bond types is crucial for analyzing molecular structure and reactivity.
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Hybridization

Hybridization is the concept that describes the mixing of atomic orbitals to form new hybrid orbitals, which can accommodate the bonding requirements of atoms in a molecule. For example, in ethyl propanoate, carbon atoms may undergo sp3 hybridization, resulting in four equivalent hybrid orbitals that can form single bonds with other atoms. This concept helps explain the geometry and bond angles in molecules.
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