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MCAT Org. Chem Ch. 1
Question | Answer |
---|---|
International Union of Pure And Applied Chemistry | Has designated standards for naming chemical compounds. |
First Step of Naming Chemical Compounds | 1. Find the longest carbon chain in the compound that carries the highest priorty functional group (parent chain) |
Second Step of Naming Chemical Compounds | 2. Number the chain in such a way that the highest-priority functional group receives the lowest possible number to determine the suffix of the molecule. |
Third Step of Naming Chemical Compounds | 3. Name the substituents with a prefix. Multiple substituents of a single type receive another prefix denoting how many are present (di-, tri-, tetra-) |
Fourth Step of Naming Chemical Compounds | 4. Assign a number to each of the substituents depending on the carbon to which it is bound. |
Fifth Step of Naming Chemical Compounds | 5. Complete the name by alphabetizing the substituents and separate numbers from each other by commas and from words by hyphens. |
Parent Chain | Longest carbon chain in a compound that contains the highest priority functional group. |
Note About How Alkanes Are Named | They are named according to the numbers of carbons present, followed by the suffix -ane |
Methane | CH4 |
Ethane | C2H6 |
Propane | C3H8 |
Butane | C4H10 |
Note About Names For Larger Alkanes | Use the Greek root for the number (pentane, hexane, heptane, octane, etc) |
Type of Bonds In Alkenes | Double bonds |
Type of Bonds In Alkynes | Triple bonds |
Suffix and Naming For Alkenes | Substitute -ene for the suffix, and number the double bond with the lower-numbered carbon in the bond. |
Suffix and Naming For Alkynes | Substitute -yne for the suffix, and number the triple bond with the lower-numbered carbon in the bond. |
Alcohols | Contain a hydroxyl (-OH) group which substitutes for one or more hydrogens in the hydrocarbon chain |
Note On How Alcohols Are Named | Substitute the suffix -ol or use the prefix hydroxyl- if a higher priority group is present. |
Note About Priority For Alcohols And Bonds | Alcohols have higher priority than double or triple bonds and alkanes. |
Diols | contain 2 hydroxyl groups |
Geminal Diols | Diols that contain two hydroxyl groups on the same carbon |
Vicinal Diols | Diols that contain two hydroxyl groups on adjacent carbons. |
Carbonyl Group | Carbon double-bonded to an oxygen |
Aldehydes | Have the carbonyl group on a terminal carbon that is attached to a hydrogen atom. |
Suffix and Prefix For Aldehydes | Suffix: -al, or use the prefix oxo- if a higher-priority group is present. |
Ketones | Have carbonyl group on a nonterminal carbon |
Suffix and Prefix For Aldehydes and Ketones | Suffix: -one. Prefix: oxo- if a higher-priorty group is present. |
Alternate Prefix For Ketones | keto- |
Note About Acetone's Significance As A Ketone | It is the smallest ketone |
Alpha-Carbon | Carbon adjacent to the carbonyl carbon |
Carboxylic Acids | Highest priority functional group because they contain three bonds to oxygen. One comes from a hydroxyl group, and two from a carbonyl group. |
Suffix for Carboxylic Acids | Suffix: -oic acid |
Esters | Carboxylic acid derivatives where -OH is replaced with -OR (an alkoxy group) |
Suffix And Prefix For Esters | Suffix: -oate. Prefix: alkoxycarbonyl- |
Amides | Replace hydroxyl group of a carboxylic acid with an amino group that may or may not be substituted. |
Suffix And Prefix For Amides | Suffix: -amid. Prefix: -carbamoyl / amido- |
Anhydrides | Formed from two carboxylic acids by dehydration. They can be symmetric (two of the same acid), asymmetric (two different acids), or cyclic (intramolecular reaction of a dicarboxylic acid) |
Suffix For Anhydrides | Suffix: -anhydride in place of acid. If an anhydride is formed from more than one carboxylic acid, both are named in alphabetical order in the name before the word anhydride. |
List Of Priority For Functional Groups | Carboxylic acid > anhydride > ester > amide > aldehyde > ketone > alcohol > alkene or alkyne > alkane |