You are here
Alkynes -
What are Alkynes:
These are the hydrocarbons in which carbon atoms are connected by triple bonds .
Example: Ethyne
- Formula of Ethyne is C 2 H 2
- There is a triple bond between 2 carbon atoms.
- Since a carbon atom has 4 valence electrons and 3 of them are shared by another carbon atom, the remaining 1 electron is shared by a hydrogen atom each.
- Hence there are a total of 1+1=2 Carbon Atoms and 1+1=2 hydrogen atoms .
General formula for Alkynes
It Is C n H 2n-2
- Where n is the number of carbon atoms.
|
Number of Carbon Atoms (n) |
n=2 |
n=3 |
n=4 |
|
Name of Alkyne |
Ethyne |
Propyne |
Butyne |
|
Structure |
|
Example : Butyne
- In butyne, there are 4 carbon atoms.
- So, the formula is:
C n H 2n-2
- Putting n=4,
C 4 H 2*4-2
C 4 H 8-2
C 4 H 6
|
Name of Alkyne |
Formula Derivation C n H 2n-2 |
Number of carbon atoms (n) |
|
Ethyne |
C 2 H 2 |
n=2 |
|
Propyne |
C 3 H 4 |
n=3 |
|
Butyne |
C 4 H 6 |
n=4 |
|
Pentyne |
C 5 H 8 |
n=5 |
|
Hexyne |
C 6 H 10 |
n=6 |
|
Heptyne |
C 7 H 12 |
n=7 |
|
Octyne |
C 8 H 14 |
n=8 |
|
Nonyne |
C 9 H 16 |
n=9 |
|
Decyne |
C 10 H 18 |
n=10 |
