Alkenes and Alkynes

There are unsaturated hydrocarbon compounds that are either connected by double bond or triple bond.  Alkenes are the ones bonded by a double bond and alkynes are the ones bonded by a triple bond.  For alkenes the root names give the number of carbons in the longest continuous chain. Alkene names are formed by dropping the "ane" and replacing it with "ene".  It is written with this formula: CnH2n.  For alkynes the root names give the number of carbons in the longest continuous chain. Alkyne names are formed by dropping the "ane" and replacing it with "yne".  It is written with this formula: CnH2n-2.

A table for alkenes:
No. of
Carbons

 Root Name

 Formula
CnH2n

 Structure

 2

 ethene
 C2H4  CH2=CH2

 3

 propene
 C3H6  CH2=CHCH3

 4

1-butene
 C4H8  CH2=CHCH2CH3

 5

 1-pentene
  C5H10  CH2=CHCH2CH2CH3

A table for alkynes:

No. of
Carbons

 Root Name

 Formula
CnH2n-2

 Structure

 2

 ethene
 C2H2  CH=CH

 3

 propene
 C3H4  CH=CHCH3

 4

1-butene
 C4H6  CH=CCH2CH3

 5

 1-pentene
  C5H8  CH=CCH2CH2CH3

Here is a video explaining name both alkenes and alkynes:

No comments:

Post a Comment