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1st of March 2017
Chemistry
Q:

how we understand iupac name

Rishàv Rààz - CBSE - Class X

Wednesday, March 01, 2017 at 09:14:AM

A:

It is the system of assignment of names to organic compounds.

System of Nomenclature are:

  • Trivial system
  • IUPAC (International Union of Pure and Applied Chemistry)

      According to IUPAC, the name of an organic compound consists of three parts

        i.Root word

       ii.Suffix

      iii.Prefix

        i.Root word

     Depends upon the number of carbon atoms present in the longest carbon chain selected.

 

Number of carbon atoms

Root Word

One carbon atom           C1

Meth

Two carbon atom          C2

Eth

Three carbon atom        C3

Prop

Four carbon atom          C4

But

Five carbon atom           C5

Pent

Six carbon atom             C6

Hex

Seven carbon atom        C7

Hept

Eight carbon atom         C8

Oct

Nine carbon atom          C9

Non

Ten carbon atom             C10

Dec

 

 

      ii.Suffix

        The root word is followed by an appropriate suffix, which represents the nature of the bond in a carbon- carbon atom.

 

Nature of bond

Suffix

General name

General formula

Single bond(C-C)

  -ane

Alkane

CnH2n+2

Double bond(C=C)

  -ene

Alkene

CnH2n

Triple bond( )

  -yne

Alkyne

CnH2n-2

Group(R-)

  -yl

Alkyl

CnH2n+1

 

     iii.Prefix

       It denotes the substituent, alkyl or functional group and its position in the carbon chain.

       Di-, tri-, tetra-, are used for two, three and four groups of the same type respectively.

 

Wednesday, March 01, 2017 at 17:52:PM