Question

In which of the following pairs, indicated bond is of greater strength?

• A. I
• B. II
• C. Both are equal
• D. None of the above

Answer 1

Answer: (B)

II

In compound (I), the double bond is tetra substituted. In compound (II), the double bond is trisubstituted.
In tetra substituted double bond, due to steric hindrance, the planar geometry is slightly twisted. Due to this the overlap of the p orbitals is not proper.
Hence, the double bond is slightly weaker in compound (I) than in compound (II).