How to find whether hydrocarbons are Alkane, Alkene or Alkyne?
Answer:
Rule for Alkane :
- If the number of Hydrogen atoms is 2 more than twice the number of carbon atoms, it is an alkane.
- General Formula: C n H 2n+2
- The formula of Ethane is C 2 H 6 .
- Number of Carbon Atoms=2
- Number of Hydrogen Atoms=2*Carbon atoms+2 = 2*2+2 = 4+2 = 6
- Since the number of Hydrogen atoms is 2 more than twice the number of carbon atoms, it is an alkane.
Rule for Alkene :
- If the number of Hydrogen atoms is exactly equal to double the number of carbon atoms, it is an alkene.
- General Formula: C n H 2
- The formula of Ethene is C 2 H 4 .
- Number of Carbon Atoms=2
- Number of Hydrogen Atoms=2*Carbon Atoms = 2*2 = 4
- Since number of Hydrogen atoms is double number of carbon atoms, it is an alkene
Rule for Alkyne:
- If the number of Hydrogen atoms is 2 less than double the number of carbon atoms, it is an alkyne.
- General Formula: C n H 2n-2
- The formula of Ethene is C 2 H 2 .
- Number of Carbon Atoms=2
- Number of Hydrogen Atoms=2*Carbon Atoms-2 = 2*2-2 = 2
- Since the number of Hydrogen atoms is 2 less than double the number of carbon.
