Question

Which option is correct about 'ethene' ?
1. It contains 2 carbon and 4 hydrogen atoms
2. It contains 2 carbon and 6 hydrogen atoms
3. It contains 3 carbon and 6 hydrogen atoms
4. None of the above

Answer 1

Correct Answer - Option 1 : It contains 2 carbon and 4 hydrogen atoms

The correct answer is 1 i.e. It contains 2 carbon and 4 hydrogen atoms.

Example:

• This hydrocarbon contains 2 carbon atoms which are indicated by writing 'eth'.
• This hydrocarbon has a carbon-carbon double bond so it is unsaturated.
• The double bond is indicated by using the ending 'ene'.
• Now, by combining, 'eth' and 'ene', the IUPAC name of the above hydrocarbon becomes; 'ethene'.
• The IUPAC name of the unsaturated hydrocarbon containing 2 carbon atoms and a double end is ethene. 
• Please note that the name of an alkene is derived from the name of the corresponding alkane by replacing the suffix ane by ene. 
• The common name of ethene is ethylene.