Naming of Organic Chemistry 2

Now we have known how to name Alkanes.Now we are learning to name Alkenes & Alkynes(Don't be confused of them).

ALKENES

Alkenes are the chemical compounds which consist only of elements Carbon(C) and Hydrogen(H) .And alkanes are linked together only by double bonds.

In the same way, the ending of alkenes are "-ene".Don't be confused by alkanes and alkenes.

Here are two alkenes.

By them, we can easily know that the general formula for Alkenes is CnH2n.

Here is a example.

This is 1-hexene.

This is 4-methyl-1-hexene.

And this is 4-methyl-2-ethyl-1-hexene.

Trans & Cis butene

For alkenes, some molecules will have the same structure but different geometry.

The first one named cis-2-butene.The second one named trans-2-butene.

cis-WX or YZ

trans-WZ or XY

There is no need for cis or trans in the name:WY or XZ.

For example,

This is cis-3,4-dimethyl-3-hexene.

ALKYNES(don't be confused by alkanes, alkenes & alkynes)

Like alkanes and alkenes, the ending of alkynes are "-yne".The naming rules of alkynes are "mostly" like alkenes but no cis or trans.
The general formula for alkynes is CnH2n-2.

eg.Naming these alkynes.

1-butyne

5-methyl-2-hexyne.

Alkenes are the chemical compounds which consist only of elements Carbon(C) and Hydrogen(H) .And alkanes are linked together only by triple bonds.