IUPAC Naming

Question 1

What does naming depend on? (2)

Answer 1

• The chain length (the gives the “parent” name)

- The name and position of functional groups or carbon side chains

Question 2

rule 1.

Answer 2

Find the longest chain in the molecule and name the molecule

Question 3

Rule 2.

Answer 3

Establish if there are single, double or triple bonds and add the suffix -ane, -ene or -yne respectively.

Question 4

Rule 3.

Answer 4

Number the carbons along the longest chain starting from the end closest to a functional group or carbon side chain. To name the carbon side chain use the same system in Rule 1 but add the ending -yl.

Question 5

Rule 4.

Answer 5

When there is more than one functional group or carbon side chain of the same kind, the figures indicating the positions of the groups are separated by commas reinforced by the use of prefixes ‘di’, ‘tri’ etc.

Question 6

Rule 5.

Answer 6

Different alkyl groups or functional groups are placed in alphabetical order in the name for a branched hydrocarbon.

Question 7

Naming and drawing of organic compounds is restricted to __ type of functional group per compound and to maximum of __ functional groups of the same type per compound, except for ____, where a maximum of two different halogen substituents (eg. bromo- and chloro-) are allowed per molecule.

Answer 7

One
Two
Haloalkanes

Question 8

What are the only substituent chains that are allowed in naming and reactions? (2)

Answer 8

methyl-

ethyl-

Question 9

A maximum of THREE substituent chains (alkyl substituents) are allowed on ___, ___, ___, ____ or _____ ___ parent chain.

Answer 9

Alkane 
Alkene 
Haloalkane 
Alcohol 
Carboxylic Acid

Question 10

When naming haloalkanes, the halogen atoms do not get preference over ___ groups–numbering should start from the end nearest to the first ____, either the alkyl group or the halogen. In haloalkanes where e.g. Br and Cl have the same number when numbered from different ends of a chain, Br gets ____ preference.

Answer 10

Alkyl
Substituent
Alphabetical

Question 11

Do we ignore di and tri when writing alphabetically?

Answer 11

Yes

Question 12

Numbers are separated from letters using a…
Numbers are separated from numbers using a….
No spaces except for ___ and ___ ___.

Answer 12

Dash
Comma
Ester
Carboxylic Acid

Question 13

For euphonic purposes, the vowel “e” is generally removed from the name before the ____. eg. butan-1-ol instead of butane-1-ol. However, this is not done for __. eg. butane-1,2-diol is correct and butan-1,2-diol.

Answer 13

Suffix

Diols

Question 14

What must be added to the name before the suffix for dienes?

Answer 14

The vowel “a”. eg. buta-1,3-diene is correct, and not but-1,3-diene.

Question 15

Fluorine
Chlorine
Bromine
Iodine

Answer 15

Fluro-
Chloro-
Bromo-
Iodo-