Question

Which of the following organic compounds has same hybridisation as its combustion (CO$_2$) product?

• A. Ethane
• B. Ethyne
• C. Ethene
• D. Ethanol

Answer 1

The Correct Option is B

To determine which organic compound has the same hybridization as its combustion product \((\text{CO}_2)\), let's examine the hybridization states of the carbon atoms in each compound and compare them with that in carbon dioxide.

1. Hybridization of Carbon in Carbon Dioxide \((\text{CO}_2)\):

   The carbon atom in \(\text{CO}_2\) is surrounded by two double bonds (O=C=O). The hybridization of carbon in \(\text{CO}_2\) is sp because it forms two sigma bonds and has a linear geometry.

2. Hybridization in Each Option:
   • Ethane \((\text{C}_2\text{H}_6)\):

     In ethane, each carbon atom forms three sigma bonds with hydrogen and one sigma bond with the other carbon atom. The hybridization is sp^3, which involves four sigma bonds.

   • Ethene \((\text{C}_2\text{H}_4)\):

     In ethene, each carbon atom forms two sigma bonds with hydrogen and one sigma bond with the other carbon atom, resulting in a pi bond as well. The hybridization is sp^2, which involves three sigma bonds.

   • Ethyne \((\text{C}_2\text{H}_2)\):

     In ethyne, each carbon atom forms one sigma bond with hydrogen and one with the other carbon atom, along with a triple bond (two pi bonds) between carbon atoms. The hybridization is sp, involving two sigma bonds.

   • Ethanol \((\text{C}_2\text{H}_5\text{OH})\):

     In ethanol, the hybridization of the carbon atoms primarily engaged in bonding with hydrogen and other carbon or oxygen atoms is sp^3 for the carbon atoms because they form four sigma bonds.

3. Conclusion:

   The only compound with the same hybridization as \(\text{CO}_2\) is Ethyne, where carbon is sp hybridized.