2 in order to specify where substituents are attached

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alkyl groups attached to it. 2. In order to specify where substituents are attached to the parent carbon chain, it is important to number the carbon atoms in the parent chain. To do this, start from the end closest to the first carbon that has an alkyl or other group substituted for a hydrogen atom. If the first substituent from each end is on the same numbered carbon, go to the next substituent to determine which end of the chain to start numbering. In the molecule shown at the left, the numbering is done so that the first substituent is located on the second carbon, rather than the fourth carbon (if numbering were initiated from the opposite end of the parent chain). 3. Name each alkyl group and designate its position on the parent carbon chain by a number (e.g., 2 – methyl means a methyl group is attached to carbon number 2). 4. When the same alkyl group branch chain occurs more than once, indicate this repetition by a prefix (di-, tri-, tetra-, and so forth) written in front of the alkyl group name (e.g., dimethyl indicates two methyl groups). The numbers indicating the positions of these alkyl groups are separated by a comma and followed by a hyphen and are placed in front of the name (e.g., 2, 3-dimethyl). 5. When several different alkyl groups are attached to the parent compound, list them in alphabetical order (e.g., ethyl before methyl in 3-ethyl-4-methyloctane). Prefixes are not included in alphabetical ordering (ethyl comes before dimethyl). The name of the molecule shown above would be: 4-ethyl-1,4-dimethylheptane 1
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Name: _____________________________ Student ID Number: __________________ Period: ______ Date: ______________________ 2
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