Topic 10 Organic chem Flashcards
Catenation
Connected in a chain or series (Eg: carbon forming long chains of covalent bonds)
Homologous series
a family of hydrocarbons with similar chemical properties who share the same general formula (eg: alkanes, alkenes)
First 4 members of the alkane homologous series
Methan, ethane, propane, butane
General formula for alkane–use it to state the molecular formula of hexane
C(n)H(2n+2)
C6H14
Functional group
A functional group is responsible for the characteristic property or behavior of a class of compounds. For example, hydroxyl ( –OH) group in alcohols.
what are the 13 main class names and their functional group names and suffixes
Alkane–N/A (-ane) Alkene–alkenyl (-ene) Alkyne–alkynyl (-yne) Alcohol–hydroxyl (-anol) Ether–ether (-oxyalkane) Aldehyde–carbonyl (-anal) Ketone–carbonyl (-anone) Carboxylic acid–carboxyl (-anoic acid) ester–ester (-anoate) amide–carboxyamide (-anamide) amine–amine (-anamine) nitrile–nitrile (-anenitrile) arene–phenyl (-benzene)
Common features of homologous series
1) same general formula
2) Same functional group
3) a gradual trend in their physical properties (eg:boiling points, density, viscosity) with the rise of molecular mass
4) differ by a -CH2- group
5) similar chemical properties (though the first may differ)
The relationship between molecular mass with melting and boiling points + intermolecular strength in a homologous series
Use this to explain the physical states of alkanes
- As the molar mass increases, the strength of the intermolecular forces between the molecules also increases, which results in a higher melting and boiling point.
- The first 4 members of the alkane series are gases, then it becomes liquids then waxy solids.
Draw the functional group structure of alkenes
Hence, draw ethene
Draw the functional group structure of alkynes
Hence, draw ethyne
Draw the functional group structure of alcohol
Hence, draw ethanol
Draw the functional group structure of ether
Hence, draw methoxyethane (no. of carb + ether + alkane)
Draw the functional group structure of aldehyde
Hence, draw propanal
Draw the functional group structure of ketone
Hence, draw propanone
Draw the functional group structure of amide
Hence, draw propanamide
Draw the functional group structure of amine
Hence, draw ethanamine