Organic Naming Level 2

Fill-in the blank with the correct name for each of the following alkanes and cycloalkanes

Naming Alkanes and Cycloalkanes

Naming Alkanes



Naming an organic compound requires several steps. What follows is a minimal outline. Consult your textbook for more details and examples.



1. Find the longest continuous chain of carbon atoms. This longest chain may not be written in a straight line.
2. Name that longest chain with the appropriate alkane name.
3. Find the substituents and name each of them with the appropriate group name.
4. Number the carbons in the chain such that the lowest number is given to the group nearest one end of the chain.
5. List the groups alphabetically in front of the longest chain name.
6. Precede each group name with a prefix indicating how many of them are present in the molecule. In front of the prefix, list the numbers of each group in the molecule and separate the numbers with a hyphen.



Rules for Naming Cycloalkanes


Cycloalkanes are ring structures with the general formula: CnH2n. Following are basic rules for naming cycloalkanes.

1. Parent Chain

Use the cycloalkane as the parent chain if it has a greater number of carbons than any alkylsubstituent.
If an alkyl chain off the cycloalkane has a greater number of carbons, then use the alkyl chain as the parent and the cycloalkane as a cycloalkyl-substituent.

2. Numbering the Cycloalkane

When numbering the carbons of a cycloalkane, start with a substituted carbon so that the substituted carbons have the lowest numbers (sum).

When two or more different substituents are present, number according to alphabetical order.

3. Halogen Substituents

Halogen substituents are treated exactly like alkyl groups