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Ch.22 - Organic Chemistry
Chapter 22, Problem 66c

Name each disubstituted benzene. c.

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Identify the substituents attached to the benzene ring. Disubstituted benzene compounds have two groups attached to the benzene ring.
Determine the relative positions of the substituents on the benzene ring. The positions can be ortho (1,2-), meta (1,3-), or para (1,4-).
Assign the lowest possible numbers to the substituents when naming the compound. The substituent with the highest priority according to IUPAC rules should be given the lowest number.
Name the substituents in alphabetical order, followed by 'benzene'. For example, if the substituents are a methyl group and a nitro group, the name would be 'methyl nitrobenzene'.
Combine the position numbers, substituent names, and 'benzene' to form the complete name of the compound, ensuring to use hyphens to separate numbers from words and commas to separate numbers.

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Key Concepts

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

Disubstituted Benzene

Disubstituted benzene refers to a benzene ring that has two substituent groups attached to it. The positions of these substituents can significantly affect the chemical properties and reactivity of the compound. The naming of disubstituted benzenes follows specific rules based on the relative positions of the substituents, which can be ortho (1,2-), meta (1,3-), or para (1,4-).
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Nomenclature of Aromatic Compounds

The nomenclature of aromatic compounds, particularly disubstituted benzenes, is governed by the IUPAC naming conventions. The base name is derived from benzene, and the substituents are named as prefixes. The positions of the substituents are indicated by numbers or by using the terms ortho, meta, and para, which help in identifying the structure of the compound clearly.
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Substituent Effects

Substituent effects refer to how different groups attached to a benzene ring influence its reactivity and stability. Some substituents are electron-donating (activating) and increase the electron density of the ring, while others are electron-withdrawing (deactivating) and decrease it. Understanding these effects is crucial for predicting the outcomes of electrophilic aromatic substitution reactions and for determining the preferred positions for new substituents.
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Naming Other Substituents Example