IUPAC Rules for naming Alkynes & Alkyl Halides



ALKYNES


Alkynes are hydrocarbons that contain a carbon-carbon triple bond.

IUPAC Rules for naming Alkynes:

The IUPAC rules for naming alkynes are analogous to those for alkenes.

Rule 1: Select the longest carbon chain containing the triple bond.This is parent chain.

Rule 2: Name the longest chain. The name is obtained by dropping the fina -ane from the name of the corresponding alkane, and adding the ending -yne.

Rule 3: Number the chain from the end closer to the triple bond.

Rule 4: Indicate the position of the triple bond by the number of the first (lowest numbered) carbon atom involved in the triple bond.

Rule 5: Alkyl groups and other substituents are numbered, name, and placed as prefixes in alphabetic order.





Rule 6: Alkynes containing two triple bonds are named as Alkadynes.




ALKYL HALIDES 


Alkyl Halides are compounds which contain carbon- halogen bonds. They are classified as primary, secondary, or tertiary, depending upon whether the halogen atom is bonded to a primary, secondary or tertiary carbon atom. Abbreviation for these terms 1°, 2° and 3°, respectively. The common names of alkyl halides are obtained by naming the alkyl group attached to the halogen and adding the name of the halide as a separate word.





IUPAC Rules for naming Alkyl Halides.
 The IUPAC names of alkyl halides are obtained by using the following rules.

Rule 1: Select the longest chain to which the halogen is attached and give it the name of the corresponding alkane.

Rule 2: Prefix the name of the alkane chloro, bromo, iodo, or fluoro.

Rule 3: Number the chain so as to give the carbon carrying the halogen atom the lowest possible number.

Rule 4: Other substituents are numbered, named and placed as prefixes in alphabetic order. If there are two or more identical halogen substituents, the prefixes di-, tri-, tetra- etc are used.

To be continued.......

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