4.1.1 Basics of Organic Chemistry: Module 4: Core Organic Chemistry: Chemistry OCR A A Level

What does nomenclature mean?

The system used for naming organic compounds.

What does the term empirical formula mean?

Simplest whole number ratio of atoms in a molecule.

What does the term molecular formula mean?

It provides the actual number of atoms of different elements in a molecule.

What does the term displayed formula mean?

It shows every atom and every bond in a molecule.

What does the term structural formula mean?

It shows the arrangement of atoms in a molecule without showing every bond.

Define skeletal formula.

A type of formula which is drawn as lines with each vertex being a carbon atom. Carbon atoms not drawn, assumed each C atom has all unspecified bonds as C-H.

Define homologous series.

A series of organic compounds having the same functional group but with each successive member differing by CH2.

What is a functional group?

A group of atoms responsible for characteristic reactions of a compound.

What is an aliphatic hydrocarbon?

Hydrocarbon with carbon atoms joined together in a straight line or branched chain.

What is an alicyclic hydrocarbon?

Hydrocarbons arranged in non aromatic rings with or without side chains.

What is an aromatic hydrocarbon?

Hydrocarbon that contains at least one benzene ring.

Give the suffixes for:

a) No double bonds

b) At least one double bond

c) An alcohol

d) An aldehyde

e) A ketone

f) A carboxylic acid

a) No double bonds -ane

b) At least one double bond -ene

c) An alcohol -ol

d) An aldehyde -al

e) A ketone -one

f) A carboxylic acid -oic acid

Give the prefixes for:

a) CH3 group

b) C2H5 group

c) C3H7 group

d) C4H9 group

e) Cl group

f) Br group

g) I group

a) CH3 group methyl-

b) C2H5 group ethyl-

c) C3H7 group propyl-

d) C4H9 group butyl-

e) Cl group chloro-

f) Br group bromo-

g) I group iodo-

What is the general formula of alkanes?

CnH2n+2

What is the general formula of alkenes?

CnH2n

What is the general formula of alcohols?

CnH2n+OH

What does saturated mean?

Organic compounds which only contain single bonds.

What are unsaturated compounds?

Organic compounds that contain at least one carbon carbon double covalent bond.

Define structural isomerism.

When molecules have the same molecular formula but different structural formula.

What are the 3 ways in which structural isomers can be formed?

1. Alkyl groups can be in different places.

2. Functional groups can be bonded to different parts.

3. There can be different functional groups.

What are stereoisomers?

Organic compounds with the same molecular formula but have different arrangement of atoms in space.

What is E-Z isomerism and how are the E and Z isomers decided?

E-Z isomerism is caused by the limited rotation about C=C double bonds.

If the two substituents with the highest molecular mass are on the same side of the double bond, it is the Z (zusammen) isomer.

If they are on different sides, it is the E (entgegen) isomer.

What is Cis-trans isomerism?

Special type of E/Z isomerism where the two substituents on each carbon atom are the same.

What is homolytic fission?

It happens when each bonding atom receives one electron from the bonded pair forming two radicals.

What is heterolytic fission?

When one bonding atom receives both electrons from the bonded pair.

What are radicals?

Highly reactive, neutral species.

How is a covalent bond formed from two radicals?

The radicals collide and the electrons are involved the bond formation.