Question

The incorrect statement regarding ethyne is

• A. The C–C bonds in ethyne is shorter than that in ethene
• B. Both carbons are sp hybridised
• C. Ethyne is linear
• D. The carbon-carbon bonds in ethyne is weaker than that in ethene

Answer 1

The Correct Option is D

To answer this question regarding ethyne's properties, we will examine each provided statement:

1. The C–C bonds in ethyne are shorter than those in ethene: This is accurate. The carbon-carbon bond in ethyne (acetylene, C₂H₂) is a triple bond, making it shorter than the double bond found in ethene (C₂H₄).
2. Both carbons are sp hybridized: This is also true. In ethyne, each carbon atom undergoes sp hybridization, resulting in a linear molecular structure with bond angles of 180 degrees.
3. Ethyne is linear: This statement is correct. The sp hybridization of the carbon atoms dictates a linear geometry for ethyne.
4. The carbon-carbon bonds in ethyne are weaker than those in ethene: This statement is false. The carbon-carbon triple bond in ethyne is stronger than the carbon-carbon double bond in ethene because triple bonds involve more orbital overlap.

Based on this analysis, the incorrect statement is: The carbon-carbon bonds in ethyne are weaker than those in ethene.