Question

Given below are two statements.
Statement I: The presence of weaker π-bonds make alkenes less stable than alkanes.
Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.

• A. Both Statement I and Statement II are correct.
• B. Both Statement I and Statement II are incorrect.
• C. Statement I is correct but Statement II is incorrect.
• D. Statement I is incorrect but Statement II is correct.

Answer 1

The Correct Option is A

Let's analyze both statements to determine their correctness:

Statement I: The presence of weaker π-bonds make alkenes less stable than alkanes.

• Alkenes contain a double bond, which consists of one σ (sigma) bond and one π (pi) bond.
• The π-bond is weaker than the σ-bond due to the sideways overlap of p-orbitals, making it prone to chemical reactions.
• As a result, alkenes are generally less stable than alkanes, which only have strong σ-bonds.
• Thus, Statement I is correct.

Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.

• A double bond in alkenes is composed of one σ-bond and one π-bond. The combination is stronger than a single σ-bond alone.
• This explains the higher bond energy of a double bond compared to a single bond, even though the π-bond by itself is weaker.
• Thus, Statement II is also correct.

In conclusion, since both statements are accurate descriptions of the characteristics of alkenes and their bonds, the correct answer is: Both Statement I and Statement II are correct.