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Ch.1 - Structure and Bonding
Wade - Organic Chemistry 9th Edition
Wade9th EditionOrganic ChemistryISBN: 9780135213728Not the one you use?Change textbook
Chapter 1, Problem 38a,b,c

Give the molecular formula of each compound shown
(a)
(b)
(c)

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1
Identify the structure of pyridine: Pyridine is a six-membered aromatic ring with one nitrogen atom. It has the formula C5H5N.
Identify the structure of pyrrolidine: Pyrrolidine is a five-membered saturated ring with one nitrogen atom. It has the formula C4H9N.
Identify the structure of furan: Furan is a five-membered aromatic ring with one oxygen atom. It has the formula C4H4O.
For each compound, count the number of carbon (C), hydrogen (H), and heteroatoms (N or O) to determine the molecular formula.
Ensure that the molecular formula reflects the correct number of each type of atom present in the structure.

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Key Concepts

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

Molecular Formula

The molecular formula of a compound indicates the number and types of atoms present in a molecule. It is expressed as a series of element symbols followed by subscripts that denote the quantity of each type of atom. For example, the molecular formula for water is H2O, indicating two hydrogen atoms and one oxygen atom.
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Structural Representation

Structural representation of a molecule visually depicts how atoms are arranged and bonded within the molecule. This can include line-angle formulas, which simplify the representation of organic compounds by showing bonds as lines and omitting hydrogen atoms attached to carbons. Understanding these structures is crucial for determining molecular formulas.
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Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In organic chemistry, recognizing functional groups helps in predicting the behavior of compounds. For instance, the presence of a nitrogen atom in pyridine indicates it is a heterocyclic aromatic compound, influencing its reactivity and properties.
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