Draw the line-angle formula for each of the following compounds:
c. 4-ethyltoluene

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Understand the structure of the compound: 4-ethyltoluene is a derivative of toluene, which is a benzene ring with a methyl group (-CH₃) attached. The '4-ethyl' indicates that an ethyl group (-CH₂CH₃) is attached to the fourth carbon of the benzene ring, relative to the methyl group.

Draw the benzene ring: Start by sketching a hexagon with alternating double bonds to represent the benzene ring. This is the base structure for toluene.

Add the methyl group: Attach a -CH₃ group to one of the carbons on the benzene ring. This is the toluene part of the compound.

Locate the fourth carbon: Number the carbons in the benzene ring starting from the carbon attached to the methyl group as position 1. Move clockwise or counterclockwise to identify the fourth carbon.

Attach the ethyl group: Add a -CH₂CH₃ group to the fourth carbon of the benzene ring. This completes the structure of 4-ethyltoluene in line-angle format.

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Line-Angle Formula

The line-angle formula, also known as the skeletal formula, is a simplified way of representing organic molecules. In this representation, vertices and endpoints of lines represent carbon atoms, while hydrogen atoms are typically omitted for clarity. This method allows chemists to visualize the structure of a compound quickly, focusing on the connectivity of atoms rather than individual bonds.

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Substituents in Organic Chemistry

Substituents are atoms or groups of atoms that replace hydrogen atoms in a hydrocarbon chain. In the case of 4-ethyltoluene, the 'ethyl' group is a substituent on the 'toluene' base structure, which is a benzene ring with a methyl group. Understanding how to identify and place substituents is crucial for accurately drawing the line-angle formula of a compound.

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Nomenclature of Organic Compounds

Nomenclature refers to the systematic naming of chemical compounds based on established rules. The name '4-ethyltoluene' indicates that an ethyl group is attached to the fourth carbon of the toluene structure. Familiarity with IUPAC nomenclature is essential for interpreting compound names and translating them into their corresponding structural representations.

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Give the IUPAC name for each of the following:

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Give the IUPAC name for each of the following:

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