Question

Expand IUPAC

Answer 1

Hint : Systematic name, most commonly known as IUPAC name are generally assigned to the compounds. It is the world authority on the chemical nomenclature as well as terminology. Thus, IUPAC nomenclature is basically a method of naming organic compounds according to certain rules.
Complete Step By Step Answer:

IUPAC stands for International Union of Pure and Applied Chemistry. IUPAC provides consistency to the names of organic compounds. The important rules that need to be followed during naming of a compound via IUPAC are:
To determine the prefix or suffix of the compound name, recognise the functional group present in the compound (as listed in table).

Functional group	Prefix or Suffix
Alkane	-ane
alkene	-ene
Alkyne	-yne
Alcohol	-ol
Aldehyde	-al
Ketone	-one
Carboxylic acid	-oic acid
ester	-oate
ether	Alkoxy-
Haloalkane	Halo-

To determine the name of compound, identify the longest and continuous chain of carbon containing the functional group and count the number of carbon atoms in the chain as shown in table below.

Number of carbon atoms	Prefix
1	Meth-
2	Eth-
3	Prop-
4	But-
5	Pent-
6	Hex-
7	Hept-
8	Oct-
9	Non-
10	Dec-

Numbering of the carbons in the longest chain of carbon (Remember that If the organic molecule is not an alkane (and has a functional group) you have to initiate numbering such that the functional group is placed on the carbon having the lowest possible number).
Check if there is any branched groups, name them and allocate the number of the carbon atom to which that group is linked. The branched groups must be mentioned before the name of the main chain in an alphabetical order.
Finally, combine the elements of the compound name in the specified order as: branched groups, prefix, suffix according to the functional group and its location along the longest carbon chain.
Hence, the answer is International Union of Pure and Applied Chemistry.

Note :
IUPAC nomenclature creates a standardized method to name the chemical compounds. It enables every compound to possess a unique name, which otherwise is not plausible with the common names. Common nomenclature employs the older names for organic compounds rather than using the prefixes for the carbon chain. IUPAC nomenclature even provides certain rules for the naming of ions as well.